CCNA_第二学期期末考试_Final_Exam
思科网络第二学期Final考试及答案
思科网络第二学期Final考试及答案思科网络第二学期Final考试及答案1.请参见图示。
对于发往 192.168.2.0的数据包，R2会采取什么操作？它会丢弃数据包。
2.请参见图示。
R1会使用哪一总结地址来向 R2通告其网络？192.168.0.0/223.请参见图示。
尽管R2已配置正确，但主机A还是无法访问Internet。
可以在R1上配置哪两条可让主机A访问Internet的静态路由？（选择两项。
ip route 0.0.0.0 0.0.0.0 Fa0/1ip route 0.0.0.0 0.0.0.0 10.1.1.24.请参见图示。
网络管理员已按图示配置了R1，并且所有接口都运作正常。
但从R1 ping 172.16.1.1时失败。
造成此问题的原因可能是什么？默认路由配置有误。
5.请参见图示。
所有接口都已编址，并且运行正常。
网络管理员在主机A上运行了tracert命令。
得到这种输出的原因可能是什么？（选择两项。
）R2的路由表中缺少 192.168.1.0/24的条目。
R1的路由表中缺少 192.168.2.0/24的条目。
6.请参见图示。
从主机 A到主机 B的 ping成功，但从主机 A ping 在Internet上正常运行的主机却失败了。
此问题的原因是什么？未在这两台路由器上配置路由协议。
7.网络管理员使用 RIP路由协议在一个自治系统内实施路由。
下列哪两项是该协议的特征？（选择两项。
使用贝尔曼-福特算法确定最佳路径。
定期将完整的路由表发送给所有连接的设备。
8.请参见图示。
两台路由器无法建立相邻关系。
此问题的原因可能是什么？这两台路由器上的 hello间隔和 dead间隔不同9.在两台路由器能够使用 OSPF形成邻居邻接关系之前必须完成哪两项任务？（选择两项。
）路由器必须在网络类型方面达成一致。
路由器必须使用相同的 dead时间间隔。
10.下列关于链路状态路由协议的陈述，哪两项是正确的？（选择两项。
CCNA2PracticeFinalExamAnswerV3.1
CCNA2PracticeFinalExamAnswerV3.11. Which statements are true regarding VTY passwords? (Choose two.)VTY passwords must be encrypted.All VTY lines do not need to use the same password.A VTY password is required to establish telnet sessions.The VTY password is set with the command line console 0.The VTY password must be identical with the enable secret password. 2.Refer to the network and routing table entries shown in the graphic. What will happen when a packet destined for network 192.66.7.0 is received by Router A?It will be forwarded through interface S1.It will be forwarded to the default route.It will be directed toward the Internet.It will be discarded.3.Which command will produce the output shown in the graphic?show cdpshow cdp neighborsshow cdp neighbors detailshow cdp detail4.Router B received an interface configuration change. Suddenly, it transmits a new update. Which of the following could have triggered this update? (Choose two.)Router B received a configuration change.Router A sent a message requesting an update.Router C came online after Router B sent the RIP update.Router B received an error message indicating the last update was not received.5. How many Telnet sessions can take place simultaneously on a router running a standard edition of the IOS?458106. Which of the following WAN connection services typically use synchronous communications? (Choose two.)circuit-switchedleased linepacket-switchedEthernetanalog modem services7. Which of the following will add a TFTP server as a fallback source fora router to load an IOS image?Router# boot system tftp 163.150.9.31 c2500-d-l.120-9Router# copy run startRouter# boot system tftp c2500-d-l.120-9.bin 163.150.9.31Router# copy run startRouter# config tRouter(config)# boot system tftp c2500-d-l.120-9.bin 163.150.9.31 Router(config)# exitRouter# copy run startRouter# config tRouter(config)# boot system tftp 163.150.9.31 c2500-d-l.120-9.binRouter(config)# exitRouter# copy run start8. What types of messages are sent periodically by devices configured for CDP?probesbeaconssignalsadvertisementsrouting updatesunicast9. An administrator has made routing protocol changes to a ro uter’s configuration. To ensure that the changes are implemented, the active configuration is saved and the router is reloaded. After the router has initialized, the output on the screen displays "Would you like to enter the initial configuration dialog?[yes/no]:" Why did this dialog appear?There was a POST failure.The incorrect IOS loaded.There was an error in the startup configuration file.The configuration register was set to ignore NVRAM.10. Which command is used to redirect debug information to a device that is connected though a Telnet session? Router# monitorRouter# terminal redirect vty 0Router# terminal monitorRouter# monitor output vty 011. After issuing the show interfaces command, a technician notices the line "Serial1 is down, line protocol is down" in the output. Which of the following are possible reasons for this message output? (Choose three.)There is a mismatch in the encapsulation type on both ends of the link.A Layer 1 issue exists.An interface problem exists.The clockrate was not set during configuration.There is no usable media for the protocol.Keepalive messages are not being sent.12.Refer to the above graphic. When using RIP as the routing protocol, how would Chicago use load balancing to route packets to New York? (Choose two.)by forwarding packets over paths of equal costby forwarding packets according to hop count and speed of the linkby determining which interface has the least traffic and sending to it firstby first determining the speed of the links and then cycling packets through the fastest links firstby cycling packets through interfaces and routes following the same pattern (Router 1, 2, 3) each time13. When would the ROM monitor mode be used? (Choose two.) maintaining routing configuration settingsmodifying the IOS image stored in Flashrunning a limited IOS feature setperforming the bootstrap process14. Which two statements are true about route metrics? (Choose two.)The more factors that make up a metric, the greater the flexibility to tailor network operations.The larger the metric number, the better the path.Routing protocols use metrics to send routing updates to directly connected neighbors.Bandwidth and delay are static metrics used by RIP v1.Ticks, delay, and cost are metrics used by routing protocols.15.Which of the following are valid static IP routes? (Choose three.) RouterB(config)# ip route 192.168.5.0 255.255.255.0 S1 RouterC(config)# ip route 192.168.1.0 255.255.255.0 S1RouterA(config)# ip route 192.168.3.0 255.255.255.0 192.168.2.2 RouterB(config)# ip route 192.168.1.0 255.255.255.0 192.168.2.2 RouterC(config)# ip route 192.168.2.0 255.255.255.0 192.168.4.1 RouterA(config)# ip route 192.168.4.0 255.255.255.0 192.168.2.116. Of the eight network users on the Human Resources department LAN, one cannot connect to the file serv er. The user’s PC has successfully booted but can not see the network. What should be checked first?the PC power cordthe file serverthe PC network interface card LEDsthe LAN switch in the wiring closetthe configuration of the router interface attached to the LAN17. What can be determined from the partial output of the show ip route command displayed below? (Choose two.)R 200.200.200.0/24 [120/1] via 192.168.10.2, 00:00:14, Serial0/0C 192.168.10.0/24 is directly connected, Serial0/0The next update will be in 76 seconds.The next update will be in 16 seconds.The administrative distance is 120 and the metric is 1.The metric is 120 and the administrative distance is 1.200.200.200.0 is configured on Serial0/0.192.168.10.2 is configured on Serial0/0.18. Why is it useful to have an interface description?A user can telnet to the router using the interface description.The interface description is a shortcut way to edit the running-config. The interface description helps identify distant network connections.The interface will remain inactive until an interface description is applied.19.Assume OSPF is being used on all routers. What happens when the link between Router1 and Router2 goes down? (Choose two.)Updates start broadcasting every 30 seconds.Updates start broadcasting every 90 seconds.Link-state advertisements are flooded.Link-state advertisements are sent only to neighboring routers.All routers note the change and adjust routes.All routers ignore the change until the route becomes active again. 20.The internetwork needs to communicate between the hosts connected to the E0 interface of the Utah router and hosts connected to the E0 interface of the Idaho router. The hosts should also have connectivity to the Internet. Which commands must be configured in order to enable this communication? (Choose three.)Idaho(config)# ip route 172.31.1.0 255.255.255.0 172.31.2.1Idaho(config)# ip route 0.0.0.0 0.0.0.0 s0Idaho(config)# ip route 172.31.2.0 255.255.255.0 172.31.2.2Utah(config)# ip route 172.31.3.0 255.255.255.0 172.31.2.1Utah(config)# ip route 172.31.3.0 255.255.255.0 s1Utah(config)# ip route 0.0.0.0 0.0.0.0 s021. Which statement about datagram life is true?Each router increments the TTL value of the datagram until the maximum hop count of the routing protocol is reached. The packet is then returned to the source.The packet is dropped when the router count and the TTL value match. The source is notified that transmission has failed. Each router decreases the TTL value by one until it reaches zero. The datagram is then discarded and a time exceeded for message is sent to the source.The destination device discards the datagram if the TTL value is zero on arrival. An ICMP destination unreachable message is sent back to the source.22.The following access list has been created to prevent traffic from host 204.204.7.122 from accessing the 201.100.11.0 network.access-list 22 deny host 204.204.7.122access-list 22 permit anyWhich group of commands will properly place this access list so that this host is denied access only to the 201.100.11.0 network?RouterA(config)# interface s0/0RouterA(config-if)# ip access-group 22 inRouterA(config)# interface s0/0RouterA(config-if)# ip access-group 22 outRouterA(config)# interface fa0/0RouterA(config-if)# ip access-group 22 inRouterB(config)# interface fa0/0RouterB(config-if)# ip access-group 22 inRouterB(config)# interface s0/0RouterB(config-if)# ip access-group 22 inRouterB(config)# interface fa0/0RouterB(config-if)# ip access-group 22 out23. A network administrator can establish a remote session to a host using the Router> telnet 192.168.1.1command but is unsuccessful when using the Router> telnet Boston command to connect to the same interface. Which of the following could be the problem? (Choose two.)The ip host table on the router is not configured.The command telnet Boston was issued from the wrong router prompt.The routing table is missing.Domain name services are not available.24. Which of the following are functions of a router? (Choose three.)packet switchingextension of network segmentssegmentation of local area networksselection of best path based on a logical addressingselection of best path based on a physical addressingThe commands shown in the graphic were entered to alter the startup sequence of the router. On the next reload, which IOS will be loaded?The router will load c2500-js-l.112-26d.The router will load c2500-d-l.120-9.The router will load the IOS from ROM.The router will boot into ROM monitor mode.26.A network administrator trying to deny Telnet traffic from the 192.5.5.0 network to the 201.100.11.0 network entered the commands shown in the graphic. When monitoring the network, the administrator noticed that Telnet packets were still passing between those networks. What is the cause?The router ignored this type of traffic because it required a standard access list to be configured instead of an extended one. The wrong port was configured for the ACL so Telnet traffic was still allowed.The access list has not been assigned to an interface.The permit ip any any allowed all traffic to pass regardless of the other statements listed in this ACL.Refer to the network graphic. A packet needs to travel from Router F to Router A. Which path would be selected by the RIP routing protocol if the default metrics are used?F, G, E, D, B, AF, E, D, C, AF, E, D, AF, E, D, B, A28. Which of the following is the correct flow of routines for a router startup?load bootstrap, load IOS, apply configurationload bootstrap, apply configuration, load IOSload IOS, load bootstrap, apply configuration, check hardwarecheck hardware, apply configuration, load bootstrap, load IOS29. In the configuration register value 0×2104, which value represents the boot field setting?x2430. ACL statements operate in sequential, logical order. If a condition match is true, the rest of the ACL statements are not checked. If all of the ACL statements are unmatched, what happens to the packet?The packets will be placed in a buffer and forwarded when the ACL is removed.The packets will be sent to the source with an error notification message.The implicit permit any statement placed at the end of the list will allow the packets to flow through uninhibited.The implicit deny any statement placed at the end of the list will cause the packets to be dropped.31. Which of the following would cause the "Message Of The Day" banner to appear? (Choose three.)telnetting into the routerinitiating a debug sessionconfiguring a router for the first timeusing the Aux port to check the current configurationusing the console port to check the current configuration32.The administrator knows that port E0 on router B connects to a small LAN without any routers. Which command can be executed on router B to conserve bandwidth on port E0?no update timersholdown-timer 96poison reverse E0passive-interface E0no triggered updates33. When must a router serial interface be configured with the clock rate command?when the interface is functioning as a DTE devicewhen the interface timers have been clearedwhen the connected DTE device is shut downwhen the interface is functioning as a DCE device34. What are the major characteristics of a wide area network? (Choose three.)connect devices separated by wide geographical areasincludes technologies of FDDI and Ethernetuses serial connections to access bandwidthcommon carriers are needed for connectionstype of connection between a router and a switch35. If the config-register on a router is set to 0×2102, where is the first place the router will look for boot system commands? RAMROMFlashNVRAM36. Why would an administrator use the Telnet application when troubleshooting a network? (Choose three.)It can be used to verify the operation of application layer software between the source and destination.Telnet can use the ICMP protocol to verify a hardware connection and network layer address.It is the most complete testing mechanism available.Remote networks may be accessed via a Telnet session for troubleshooting.Time to Live values are used by Telnet to identify a failure of device between source and destination.37.The network shown in the graphic is using RIP as the routing protocol. Which of the following are true regarding the network discovery process that will occur for this network? (Choose three.)The Palm Beach router will show networks 192.168.7.0 and 192.168.8.0 as directly connected networks.All of the routers will have direct knowledge of the exact topology of the entire network.The Key West router will forward routing table information to the Miami and Palm Beach routers.The Miami router will learn about network 192.168.1.0 from the Key West router.If network 192.168.4.0 becomes unavailable, the Key West router will notify the other routers of this fact in the next update.38. Which of the following are characteristics of the Open Shortest Path First (OSPF) routing protocol? (Choose two.) functions as a link-state routing protocoldiscards packets when the hop count is greater than 15calculates the shortest path to a destination using the Diffused Update Algorithm (DUAL)created as a proprietary routing protocolfloods updates as topology changes occurbroadcasts routing updates every 90 seconds or as triggered by topology changes39. The following line was displayed in the output of the show ip route command.R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0What is the value of the routing metric?312203012040.Refer to the output from the show ip route command. What can be concluded from the output of this router command?A preferred route to the destination has not been set.There are two equal cost paths to network 1.0.0.0.Both interfaces are being used equally to route traffic.A variance must be set to load-balance across multiple paths.41. Which of the following are true statements about creating and applying access lists? (Choose three.)Access list entries should filter in the order from general to specific.One access list per port per protocol per direction is permitted.Standard ACLs should be applied closest to the source while extended ACLs should be applied closest to the destination. There is an implicit deny at the end of all access lists.Statements are processed sequentially from top to bottom until a match is found.The inbound keyword refers to traffic entering the network from the router interface where the ACL is applied.42. Which of the following are true regarding the setup configuration mode? (Choose three.)To abort the setup mode, use the CTRL+SHIFT+6 keys.To abort the setup mode, use the CTRL+C keys.Setup mode allows a complete configuration of the router.To enter setup mode, use the privileged mode setup command.A router that does not find a valid IOS during the boot process will start the system configuration dialog.A router that does not find a valid configuration file during the boot process will start the system configuration dialog.43. Which of the following are necessary for basic network communication to occur between hosts that will run such applications as Telnet, web browsers, and e-mail? (Choose three.)TCP/IP must be installed and properly configured on each device.。
ESwitching Final Exam第2套
请参见图示。
连接到交换机X 上的VLAN 10 中的主机通过以下哪种方法可以与连接到交换机Y 上的VLAN 10 中的主机通信？QoS路由(routing)中继VPNVoIP子接口请参见图示。
所有交换机都配置有默认的网桥优先级。
如果所有链路都在相同的带宽下运行，哪个端口将作为非指定端口？交换机 A 的Fa0/1 接口交换机 A 的Fa0/2 接口交换机 B 的Fa0/1 接口交换机 B 的Fa0/2 接口交换机 C 的Fa0/1 接口交换机 C 的Fa0/2 接口请参见图示。
网络管理员希望允许用户通过SSH 和Telnet 连接访问Switch1。
但是SSH 连接却失败了。
此问题最可能的原因是什么？未删除RSA 密钥。
SSH 被配置在错误的线路上。
transport input命令应用不正确。
配置域名时进入的配置模式错误。
请参见图示。
SW1 是一台2960 交换机，已对其指定了默认值。
下列关于开销值38 对SW1 的意义的说法中哪两项正确？（选择两项。
）SW1 通过两条快速以太网链路连接到根交换机。
此开销代表从SW1 到根交换机的最快路径的数字值。
开销值38 是上游交换机（更接近根交换机）的端口26 向外通告的值。
SW1 将快速以太网链路的开销相加后得出38，从而确定到达根交换机所需的总开销。
根交换机通告的开销值是38，该值比加入VLAN0001 生成树域的其它任何交换机的值都低。
SW1 通过快速以太网链路连接到上游交换机，该上游交换机则通过千兆以太网链路直接连接到根交换机。
生成树算法的作用是什么？向其它交换机传播VLAN 配置。
将广播数据包限制到一个VLAN。
将网络划分为多个广播域。
防止包含冗余路径的交换网络中出现环路。
单臂路由器VLAN 间路由有哪三项特征？（选择三项。
）需要使用VTP需要使用子接口减少广播域的数量使用过多VLAN 时会影响性能需要在路由器和至少一台交换机之间采用接入链路比用于VLAN 间路由的其它方法更加经济规定至少要在路由器和交换机之间使用两个交换机端口请参见图示。
CCNA期末测试多选题
CCNA期末测试多选题多选题：1、对于这样一个地址,192.168.19.255/20,下列说法正确的是: （）(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案：CE2、下面有关NAT叙述正确的是（）(A) NAT是英文“地址转换”的缩写，又称地址翻译(B) NAT用来实现私有地址与公用网络地址之间的转换(C) 当内部网络的主机访问外部网络的时候，一定不需要NAT(D) 地址转换的提出为解决IP地址紧张的问题提供了一个有效途径答案：ABD3、关于VLAN下面说法正确的是（）(A) 隔离广播域(B) 相互间通信要通过路由器(C) 可以限制网上的计算机互相访问的权限(D) 只能在同一个物理网络上的主机进行逻辑分组答案:ABC4、下面对路由器的描述正确的是（交换机指二层交换机）（）(A) 相对于交换机和网桥来说，路由器具有更加复杂的功能(B) 相对于交换机和网桥来说，路由器具有更低的延迟(C) 相对于交换机和网桥来说，路由器可以提供更大的带宽和数据转发功能(D) 路由器可以实现不同子网之间的通信，交换机和网桥不能(E) 路由器可以实现虚拟局域网之间的通信，交换机和网桥不能答案:ADE5、关于IP报文头的TTL字段，以下说法正确的有（）（多选）(A) TTL的最大可能值是65535(B) 在正常情况下，路由器不应该从接口收到TTL=0的报文(C) TTL主要是为了防止IP报文在网络中的循环转发，浪费网络带宽(D) IP报文每经过一个网络设备，包括Hub、LAN SWITCH和路由器，TTL值都会被减去一定的数值答案:BC6、VLAN的划分方法有（多选）（）(A) 基于设备端口(B) 协议(C) MAC(D) 物理地址答案:ABCD7、路由项10.0.24.0/21由哪几条子网路由聚合而来（）(A) 10.0.0.25/16(B) 10.0.0.23/16(C) 10.0.0.26/16(D) 10.0.0.22/16答案:AC8、在OSPF中，以下（）是两台路由器成为邻居关系的必要条件。
CCNA第二学期考试答案
以下是针对您未获得满分的试题给出的反馈。
某些交互式试题可能不显示您的答案。
分项分数：1与固定配置的交换机相比，模块化交换机具有哪两个优点？（请选择两项。
）正确响应您的响应每台交换机的成本更低可扩展性更高转发率更低需要的电源插座数目更少带宽聚合可以使用多个端口固定配置交换机价格较低，但是它具有指定数量的端口且不能添加端口。
它们提供的高速端口通常比较少。
为了在包含固定配置交换机的网络上扩展交换，需要购买更多的交换机。
这增加了需要使用的电源插座数量。
模块化交换机只需要购买额外的线卡便可以扩展。
带宽聚合也更容易，因为机箱的背板可以为交换机端口线卡提供所需的带宽。
此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.2 交换网络2思科无边界架构接入层的基本功能是什么？正确响应您的响应聚合第 2 层广播域聚合第 3 层路由边界为用户提供访问权提供高可用性思科无边界架构接入层的功能是为用户提供网络访问。
第 2 层广播域聚合、第 3 层路由边界聚合和高可用性是分布层的功能。
也有说答案是聚合第 3 层路由边界此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络3思科无边界架构分布层的基本功能是什么？正确响应您的响应充当主干聚合所有园区块聚合第 3 层路由边界为用户提供访问权思科无边界架构的分布层的一项基本功能是在不同的VLAN 之间路由。
充当主干和聚合园区块是核心层的功能。
为用户提供访问是接入层的功能。
此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络4若将大端口密度、容错和低价作为重要指标，应使用哪个交换机外形因素？正确响应您的响应固定配置交换机模块化交换机可配备机架的1U 交换机可堆叠式交换机堆叠式交换机可以使用特殊电缆实现互联，从而在交换机之间提供高带宽的吞吐量，并像单个大型交换机一样运行。
CCNA2期末测试题
1请参见图示。
对于发往192.168.2.0 的数据包，R2 会采取什么操作？它会丢弃数据包。
它会通过S0/0/0 接口转发数据包。
它会通过Fa0/0 接口转发数据包。
它会将数据包转发给R1。
2请参见图示。
R1 会使用哪一总结地址来向R2 通告其网络？3请参见图示。
尽管R2 已配置正确，但主机A 还是无法访问Internet。
可以在R1 上配置哪两条可让主机A 访问Internet 的静态路由？（选择两项。
）ip route .0 0.0.0.0 Fa0/0ip route .0 0.0.0.0 Fa0/1ip routeip routeip route 209.165.202.0 255.255.255.0 .14请参见图示。
网络管理员已按图示配置了R1，并且所有接口都运作正常。
但从R1 ping 172.16.1.1 时失败。
造成此问题的原因可能是什么？R1 上的串行接口配置有误。
默认路由配置有误。
必须在R1 上发出default-information originate命令。
必须在R1 上禁用自动总结。
5请参见图示。
所有接口都已编址，并且运行正常。
网络管理员在主机A 上运行了tracert命令。
得到这种输出的原因可能是什么？（选择两项。
）主机A 缺少网关或配置不正确。
主机B 缺少网关或配置不正确。
R1 的路由表中缺少192.168.1.0/24 的条目。
R2 的路由表中缺少192.168.1.0/24 的条目。
R1 的路由表中缺少192.168.2.0/24 的条目。
R2 的路由表中缺少192.168.2.0/24 的条目。
6请参见图示。
从主机A 到主机B 的ping 成功，但从主机A ping 在Internet 上正常运行的主机却失败了。
此问题的原因是什么？R1 的快速以太网接口被禁用。
其中一条默认路由配置有误。
未在这两台路由器上配置路由协议。
主机A 上尚未配置默认网关。
7 网络管理员使用RIP 路由协议在一个自治系统内实施路由。
CCNA第二学期final
参加考试- DsmbISP Final Exam - CCNA Discovery: Working at a Small-to-Medium Business or ISP (版本4.1)剩余时间: 02:59:59正在显示第1 页，共4 页下一页>页: 1跳转<上一页1在图中所示的其中一台路由器上执行show ip route命令，显示下列输出：C 192.168.4.0/24 is directly connected, Serial0/0R 192.168.5.0/24 [120/1] via 192.168.4.2, 00:00:19, Serial0/0R 192.168.1.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1R 192.168.2.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1C 192.168.3.0/24 is directly connected, Serial0/1此命令是从哪一台路由器执行的？ABCD当NVRAM 中没有配置文件时，路由器将进入哪种模式？2ROMMON设置全局配置特权执行3最常用的外部路由协议是什么？BGPRIPOSPFEIGRP端口过滤和访问列表通过什么方式来增强网络安全？4防止特定类型的通信到达特定网络主机。
遭受各类拒绝服务攻击时提醒网络管理员。
防止病毒、蠕虫和特洛伊木马感染主机计算机和服务器。
可对机密数据通信进行加密和身份认证。
5显示配置文件时，哪两个命令可以确保允许访问特权执行模式的口令不以纯文本显示？（选择Router(config)# enable secret ciscoRouter(config)# enable ciscoRouter(config)# encryption-password allRouter(config)# enable login encryptedRouter(config)# enable password encryptionRouter(config)# service password-encryption192.168.17.111/28 属于哪一类地址？6主机地址网络地址广播地址组播地址7请参见图示。
CCNA2 final期末考试答案A
1.A technician configures the Fa0/0 interface on a router with ip address 192.168.3.5 255.255.255.252. What additional comma issued by the technician to activate the interface to forward traffic?Router(config-if)# exitRouter(config-if)# no shutdownRouter(config-if)# clock rateRouter# copy running-config startup-config2Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that interface FastEthernet0/1 is not functioning. Which action will most likely correct the problem with FastEthernet0/1?A clock rate should be added to the interface configuration.The subnet mask should be added to the interface configuration.An interface description needs to be added to the interface configuration.The no shutdown command needs to be added to the interface configuration.3Refer to the exhibit. A router interface is configured with the command ip address 172.16.3.31 255.255.192.0. Which set o values would allow a computer that is connected to the router interface to communicate with remote networks?A: 172.16.3.254B: 255.255.192.0C: 172.16.3.31A: 172.16.3.31B: 255.255.192.0C: 172.16.3.255A: 172.16.3.254B: 255.255.255.0C: 172.16.3.31A: 172.16.3.31B: 255.255.255.0C: 172.16.3.14Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will be l routing table?ssss5Refer to the exhibit. PC1 is unable to access the Internet. What is the cause of the problem?An incorrect IP address is configured between the two routers.No static route is configured on Router2.A routing loop has occurred.No routing protocol is configured on either of the two routers.Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.)The route to network 172.16.0.0 has an AD of 156160.Network 192.168.0.16 can best be reached using FastEthernet0/0.The AD of EIGRP routes has been manually changed to a value other than the default value.Router1 is running both the EIGRP and OSPF routing process.Network 172.17.0.0 can only be reached using a default route.No default route has been configured.7Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are displaye are operational and pings are not blocked on this network.Which ping will fail?from R1 to 172.16.1.1from R1 to 192.168.3.1from R2 to 192.168.1.1from R2 to 192.168.3.18Refer to the exhibit. A network administrator has configured OSPF using the following command:network 192.168.1.32 0.0.0.31 area 0Which router interface will participate in OSPF?FastEthernet0/0FastEthernet0/1Serial0/0/0Serial0/0/19Refer to the exhibit. The hosts on the R1 LAN are unable to access the Internet. What is incorrectly configured?the IP address of the Fa0/0 interface at R1the IP address of the S0/0/1 interface at R2the IP address of the S0/0/0 interface at R1the subnet mask of the S0/0/1 interface at R210Refer to the exhibit. Host A is having problems accessing server A. All routers have the same EIGRP configuration as rou What should be done so that host A can access server A?Add the command no auto-summary on all routers.Change the network statements to include a wildcard mask.Adjust the EIGRP hello timers to account for the network delay.Add the command eigrp log-neighbor-changes on all routers.Which feature of RIPv2 enables it to function as a classless routing protocol?Subnet masks are included in routing updates.Routing updates are triggered by topology changes.Next-hop addresses are included in routing updates.Multicast addresses are used to send routing updates.12A network administrator must use the subnet 172.16.128.0/18 to create 6 additional subnets each containing up to 2000 hLANs. Which subnet mask should the administrator use to create the new subnets?255.255.224.0255.255.240.0255.255.248.0255.255.252.013 A network administrator is in charge of two separate networks that share a single building. What device will be required totwo networks and add a common connection to the Internet that can be shared?hubrouteraccess pointEthernet switch14Refer to the exhibit. What needs to be done to allow these two routers to connect successfully?Add a clock rate to S0/0/0 on R1.Add an interface description to S0/0/1 on R2.Change the serial interface on R2 to S0/0/0 so that it matches R1.Change the IP address of S0/0/1 on R2 so that it is in the same subnet as R1.15In which situation would a default static route be recommended?when connecting an edge router to the Internetwhen variable length subnet masking is in effectwhen there is more than one valid route for a destination networkwhen a destination network has a larger mask than any routes in the routing tableRefer to the exhibit. A network engineer has run the show version command on R3. Upon rebooting, R3 does not load th configuration settings.What could be the cause of this problem?There is insufficient NVRAM.There is insufficient flash memory.The configuration register is not configured with the default setting.The system image file is not located in NVRAM.17Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this?The IP address of host A is incorrect.The default gateway of host A is incorrect.The Fa0/1 interfaces of the two routers are configured for different subnets.The subnet mask for the Fa0/0 interface of R1 is incorrect.18Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly configur operational. Both routers are configured to include all connected interfaces in routing updates. R2 is not showing any rout the routing table. What is the likely cause?The adjacent interfaces are passive.The distance of 120 exceeds 15 hops.R2 will not accept version 1 updates from R1.19W hich two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.)authenticationlink-state advertisementshold-down timersSpanning Tree Protocolsplit horizon20Which prompt is used to allow a user to change the IP address of an interface on a router?Router>Router#Router(config)#Router(config-if)#Refer to the exhibit. A network administrator adds this command to router R1: ip route 192.168.2.0 255.255.255.0 S0/0/0 result of adding this command?This route is automatically propagated throughout the network.The traffic for network 172.16.1.0 is forwarded to network 192.168.2.0.A static route is established.The traffic for all Class C networks is forwarded to 172.16.1.2.22Refer to the exhibit. What information can be determined from the displayed output?EIGRP packets are waiting to be sent to the neighbors.The adjacencies between the routers are yet to be established.The IP address 192.168.10.10 is configured at serial interface S0/0/1 of router R2.Router R2 is receiving hello packets from a neighbor with the IP address 192.168.10.10 via the R2 S0/0/1 interface.23Refer to the exhibit. Based on the partial output in the exhibit, why can users establish a console connection to this router entering a password?The login command was not entered on the cons ole line.The enable password should be an enable secret password.No username and password combination has been configured.Console connections cannot be configured to require users to provide passwords.24W hich of the following are primary functions of a router? (Choose two.)packet switchingmicrosegmentationdomain name resolutionpath selectionflow control25Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can a static altered to accommodate a topology change?Keep the existing static route and configure a new static route with the correct next hop IP address.Negate the existing static route and configure a new static route with the correct next hop IP address.Do nothing. The existing static route will automatically update the next hop entry with the new IP address.Keep the existing static route, reload the router, and configure a new static route with the correct next hop IP addresRefer to the exhibit. All routers are configured with no auto-summary. All routers have a default route via their Serial0/1 Router B receives a packet with a destination of 10.16.1.98. What path will the packet take?B-EB-E-D-AB-E-D-A then loop A-D-A until the TTL expiresB will immediately drop the packet.There is insufficient information to answer the question.27Refer to the exhibit. A network administrator is investigating why data packets with destination addresses of 172.16.10.10 192.168.10.100 are being dropped instead of being forwarded via the static route as expected. After confirming that the ip command has been applied on all routers in the network, what other action should the administrator take to ensure that da these addresses are forwarded via the static route?Check that all routers are configured with the same autonomous system number.Issue the no auto-summary command within the EIGRP configuration of all routers.Issue the no passive-interface command within the EIGRP configuration of all routers.Configure the static route to point to the next hop address instead of the outbound interface.28If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from whe router try to load the IOS image first?ROMRAMNVRAMflashTFTP server29T wo routers need to be configured within a single OSPF area. Which two components need to be configured on both rout this? (Choose two.)the same process IDthe same area IDnetwork addresses and wildcard masksthe same router IDthe same loop back address30Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choos10.0.0.0/864.100.0.0/16128.107.0.0/16172.16.40.0/24192.168.1.0/24192.168.2.0/24Which candidate route has the longest match for a packet with a destination address of 10.30.16.48?10.30.0.0/1610.30.15.0/2310.30.16.0/2410.30.16.32/2710.30.16.32/3032W hich three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a r (Choose three.)The router modifies the TTL field, decrementing it by one.The router changes the source IP to the IP of the exit interface.The router maintains the same source and destination IP.T he router changes the source physical address to the physical address of the exit interface.The router changes the destination IP to the IP of the exit interface.The router sends the packet out all other interfaces, besides the one it entered the router on.33Refer to the exhibit. The interfaces of all routers are configured for OSPF area 0. R3 can ping R1, but the two routers are establish a neighbor adjacency. What should the network administrator do to troubleshoot this problem?Check if the interfaces of the routers are enabled.Check the hello and dead intervals between the routers.Check the process ID of both routers.Check if CDP is enabled on all the routers.34W hich mechanism helps to avoid routing loops by advertising a metric of infinity?route poisoningsplit horizonhold-down timertriggered updates35Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which tw o devices for this? (Choose two.)a CSU/DSU devicea modeman Ethernet switcha huba bridge36Why is fast convergence desirable in networks that use dynamic routing protocols?Hosts are unable to access their gateway until the network is converged.Routers will not allow packets to be forwarded until the network is converged.Routers may make incorrect forwarding decisions until the network has converged.Routers will not allow configuration changes to be made until the network has converged.37Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the network.commands is required to configure a single area OSPF for the networks that are connected to R2?R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config)# router ospf 2R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 1R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.0.0.0 0.0.0.3 area 138Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network?ADCABCIt will load balance the traffic between ADC and ABCIt will send the traffic via ABC, and will use ADC as a backup path only when ABC fails.39W hat are two ways that a router can learn of the paths to destination networks? (Choose two.)updates from other routersDHCP information broadcastsmanual configuration of routesARP requests from connected routersinspection of the destination IP address in data packetsupdates from the SMTP management information base40Refer to the exhibit. The network administrator has run the following command on R1.R1(config)# ip route 192.168.2.0 255.255.255.0 172.16.1.2What is the result of running this command?Traffic for network 192.168.2.0 is forwarded to 172.16.1.2.This route is automatically propagated throughout the entire network.Traffic for all networks is forwarded to 172.16.1.2.The command invokes a dynamic routing protocol for 192.168.2.0.Refer to the exhibit. What is the meaning of the highlighted value 120?It is the metric that is calculated by the routing protocol.It is the value that is used by the DUAL algorithm to determine the bandwidth for the link.It is the administrative distance of the routing protocol.It is the hold-down time, measured in seconds, before the next update.42Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is tru how the routers in this topology will respond to this event?Router4 will learn about the failed route 30 seconds later in the next periodic update.Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expires.Router5 immediately flushes the unreachable route from its routing table.Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0.43Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Router2 in o interface in the same network as the serial interface of Router1?IP 172.16.0.18, subnet mask 255.255.255.0IP 172.16.32.15, subnet mask 255.255.255.240IP 172.16.0.18, subnet mask 255.255.255.252IP 172.16.32.18, subnet mask 255.255.255.25244W hich statement is true about the RIPv1 protocol?It is a link-state routing protocol.It excludes subnet information from the routing updates.It uses the DUAL algorithm to insert backup routes into the topology table.It uses classless routing as the default method on the router.45Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2?192.168.1.0/24192.168.0.0/24192.168.0.0/22192.168.1.0/22Which two statements are true for link-state routing protocols? (Choose two.)Routers that run a link-state protocol can establish a complete topology of the network.Routers in a multipoint network that run a link-state protocol can exchange routing tables.Routers use only hop count for routing decisions.T he shortest path first algorithm is used.Split horizon is used to avoid routing loops.47A router learns about network 192.168.10.128/27 from multiple sources. Which option represen ts the best route and will berouting table?S 192.168.10.128/27 [1/0] via 192.168.10.226R 192.168.10.128/27 [120/2] via 192.168.10.226, 00:00:14, Serial0/0/0O 192.168.10.128/27 [110/1563] via 192.168.10.226, 00:00:09, Serial0/0/0D 192.168.10.128/27 [90/21026560] via 192.168.10.226, 00:00:16, Serial0/0/048Refer to the exhibit. When all of the commands that are shown in the exhibit are entered at the correct router prompt, wha of the router?nameciscorouterhostname49W hich statement is true about the metrics used by routing protocols?A metric is a value used by a particular routing protocol to compare paths to remote networks.A common metric is used by all routing protocols.The metric with the highest value is installed in the routing table.The router may use only one parameter at a time to calculate the metric.50Which two statements are true about the EIGRP successor route? (Choose two.)It is saved in the topology table for use if the primary route fails.It may be backed up by a feasible successor route.It is used by EIGRP to forward traffic to the destination.It is flagged as active in the routing table.After the discovery process has occurred, the successor route is stored in the neighbor table.Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip databa However, upon running the show ip route command, the network administrator sees that the router has installed a differe 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route?Compared to RIP, EIGRP has a lower administrative distance.Compared to EIGRP, RIP has a higher metric value for the route.Compared to RIP, the EIGRP route has fewer hops.Compared to RIP, EIGRP has a faster update timer.52A network administrator is analyzing routing update behavior on a network that has both EIGRP and OSPF configured on Both protocols appear in the output of show ip protocols. However, only EIGRP internal routes appear in the routing tabstatement correctly explains the scenario?The OSPF protocol has a higher cost than EIGRP.The EIGRP protocol has a lower metric than OSPF.The EIGRP protocol was configured first on the router.The EIGRP protocol has a lower administrative distance than OSPF.。
CCNA第二学期final - - 3(路由)
CCNA第二学期final - - 3（路由）1请参见图示。
Sales 网络中部署了一台新 PC。
它的主机地址为 192.168.10.31，默认网关为 192.168.10.17。
该 PC 无法与网络正常通信。
原因是什么？默认网关不正确。
该地址位于错误的子网中。
主机地址和默认网关设反了。
192.168.10.31 是该子网的广播地址。
下列关于链路状态路由协议的陈述，哪两项是正确的？（选择两项。
）链路状态路由协议了解整个网络的拓扑结构。
链路状态路由协议可以使大型网络快速达到收敛。
链路状态路由协议的路由更新中不包含子网掩码。
链路状态路由协议根据跳数从高到低的顺序来确定最佳路径。
链路状态路由协议不适合具有特定层次结构的网络。
链路状态路由协议仅向直连的邻居发送整个路由表。
2请参见图示。
排查网络故障时，理解各种路由器命令的输出非常重要。
根据图中显示的信息，下列哪三条叙述是正确的？（1 处缺少的信息为 show ip route 命令。
1 处缺少的信息为 debug ip route 命令。
2 处缺少的信息为数字 100。
2 处缺少的信息为数字 120。
3 处缺少的信息为字母 R。
3 处缺少的信息为字母 C。
3 OSPF 和 IS-IS 路由器在构建最短路径优先数据库时执行的第一个步骤是什么？获知直连网络发送 hello 以发现邻居并形成邻接关系选择后继路由器和可行后继路由器以传播拓扑表向所有邻居发送 LSP，通知它们所有已知的网络及其链路状态4网络管理员在所示网络图中的路由器 B 和 C 上启用了 RIP。
什么命令可防止向路由器 A 发送 RIP 更新？ A(config)# router ripA(config-router)# passive-interface S0/0B(config)# router ripB(config-router)# network 192.168.25.48 B(config-router)# network192.168.25.64 A(config)# router ripA(config-router)# no network 192.168.25.32B(config)# router ripB(config-router)# passive-interface S0/0A(config)# no router rip5IP 数据包报头中的 TTL 字段有什么作用？在无效计时器超时后从路由表中清除不可达路由防止定期更新消息错误地恢复可能已经出错的路由在清除计时器超时后从路由表中删除不可达路由限制数据包在被丢弃之前能够在网络中传输的时间长度或跳数用于在发往其它路由器的路由更新中将路由标记为不可达6如图所示的网络在路由流量时存在问题，怀疑这可能是编址方案所造成。
ccna final试卷答案
As network administrator, what is the subnet mask that allows 510 hosts given the IP address 17255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.1282Refer to the exhibit. What is the correct destination socket number for a web page request fro to the web server?00-08-a3-b6-ce-46198.133.219.25:80h ttp://C 198.133.219.0/24 is directly connected, FastEthernet0/0Refer to the exhibit. Which two statements describe the information that is represented in the he (Choose two.)T his is a server response.The UDP protocol is being used.T he destination port indicates a Telnet session.The return segment will contain a source port of 23.The next session originated from the client of this session will use the source port number 134In a Cisco IOS device, where is the startup-configuration file stored?FlashNVRAMR AMROM5Refer to the exhibit. The network containing router B is experiencing problems. A network ashas isolated the issue in this network to router B. What action can be preformed to correct th issue?issue the clock rate command on interface Serial 0/0/0issue the description command on interface Serial 0/0/1issue the ip address command on interface FastEthernet 0/0i ssue the no shutdown command on interface FastEthernet 0/1Refer to the exhibit. Which set of devices contains only intermediary devices?A, B, D, GA, B, E, FC, D, G, IG, H, I, J7Refer to the exhibit. The command that is shown was issued on a PC. What does the IP add 192.168.33.2 represent?I P address of the hostdefault gateway of the hostI P address of the homepage for the hostprimary domain name server for the hostIP address of the website resolver1.mooki.local8Which OSI layers offers reliable, connection-oriented data communication services?applicationpresentations essiontransportn etwork9Which OSI layer manages data segments?application layerp resentation layersession layert ransport layer10Which three statements are true about network layer addressing? (Choose three.) It uniquely identifies each host.I t assists in forwarding packets across internetworks.It uses a logical 32-bit IPv4 address.I t is not a configurable address.It is a physical address.It identifies the host from the first part of the address.Which device should be used for routing a packet to a remote network?a ccess switchDHCP serverh ubrouter12Which information is used by the router to determine the path between the source and destination hosts?t he host portion of the IP addresst he network portion of the IP addressh ost default gateway addresst he MAC address13Refer to the exhibit. Each media link is labeled. What type of cable should be used to connect the different devices?Connection 1 - rollover cable Connection 2 - straight-through cableConnection 3 - crossover cableConnection 1 - straight-through cable Connection 2 - crossovercable Connection 3 - rollover cableConnection 1 - crossover cable Connection 2 - rollover cableConnection 3 - straight-through cableConnection 1 - crossover cable Connection 2 - straight-throughcable Connection 3 - rollover cableConnection 1 - straight-through cable Connection 2 -straight-through cable Connection 3 - straight-through cable14Refer to the exhibit. A user wants to view the current configuration. The output ofthe ipconfig/all command is displayed in the exhibit. What three facts can be determined from output? (Choose three.)The IP address is obtained from the DHCP server.This PC cannot communicate with other networks.The network can have 14 hosts.The prefix of the computer address is /25.The IP address is routable on the Internet.The assigned address is a private address.15Refer to the exhibit. The network administrator wants to remotely access the CLI of the router using modem 1. Which port of the router should be connected to modem 2 to enable this accconsoleE thernetauxiliaryserialRefer to the exhibit. Which logical topology describes the exhibited network?starringp oint-to-pointmulti-access17Refer to the exhibit. The PC, the routing table of which is displayed, is configured correctly. T network device or interface does the IP address 192.168.1.254 belong?P Cswitchr outer interface fa0/0router interface fa0/118Refer to the exhibit. To create the initial configuration, a network technician connected host A router using the connection that is shown. Which statement is true about this connection?It terminates at the Ethernet port of the router.It provides out-of-band console access.It terminates at the serial interface of the router.I t requires a Telnet client on host A to access the router.19Refer to the exhibit. Which two facts can be determined about the topology? (Choose two.)F our collision domains are present.One logical network is represented.T wo broadcast domains are present.Three networks are needed.Three logical address ranges are required.20Refer to the exhibit. The NAT functionality of the router is enabled to provide Internet access However, the PC is still unable to access the Internet. Which IP address should be changed 209.165.201.1 to enable the PC to access the Internet?192.168.1.191192.168.1.101192.168.1.1192.168.1.254Refer to the exhibit. A network technician wants to connect host A to the console of a Cisco swit initialize the configuration. What type of cable is required for this connection?straight-through cablec rossover cablerollover cables erial cable22Which three addresses belong to the category of private IP addresses? (Choose three.)10.0.0.1127.0.0.1150.0.0.1172.16.0.1192.168.0.1200.100.50.123An organization has decided to use IP addresses in the range 172.20.128.0 to 172.20.143.255. Which combination of network ID and subnet mask identifies all IPaddresses in this range?Network ID: 172.20.128.0 Subnet mask: 255.255.255.0N etwork ID: 172.20.128.0 Subnet mask: 255.255.0.0Network ID: 172.20.128.0 Subnet mask: 255.255.224.0Network ID: 172.20.128.0 Subnet mask: 255.255.240.0N etwork ID: 172.20.128.0 Subnet mask: 255.255.255.24024A network administrator wants to restrict access to the router privileged EXEC mode.Which password should the administrator use?e nableauxc onsoleV TY25While configuring a router, a network technician wants to name the router. Which prompt sho technician see when entering the hostname command?Router>Router#R outer(config)#Router(config-line)#Which three IPv4 addresses represent subnet broadcast addresses? (Choose three.)192.168.4.63 /26192.168.4.129 /26192.168.4.191 /26192.168.4.51 /27192.168.4.95 /27192.168.4.221 /2727During the encapsulation process, what identifiers are added at the transport layer?source and destination IP addressess ource and destination MAC addressessource and destination port numberss ource and destination channel identifiers28Refer to the exhibit. Which service is needed in order for the hosts to access the Internet?NATR IPFTPDHCP29Refer to the exhibit. A student has wired each end of a CAT 5e cable as shown. What is the (Choose two.)T he cable is unusable and must be rewired.The cable is suitable for use as a rollover cable.T he cable is suitable for use as a Fast Ethernet crossover.The cable is suitable for use as a Gigabit Ethernet straight-through.The cable is suitable for use between two 100 Mbps Auto-MDIX capable switches.30Refer to the exhibit. A web browser running on host PC1 sends a request for a web page to server with an IP address 192.168.1.254/24. What sequence of steps will follow in order to e the session before data can be exchanged?The session will be initiated using UDP. No additional acknowledgment will be required to the session.The session will be initiated using TCP. No additional acknowledgment will be required to the session.The session will be initiated using UDP. The returned web page will serve as an acknow for session establishment.The session will be initiated using TCP. A three-way handshake must be successfully co before the session is established.The tracert 10.1.3.2 command was issued on computer A. Computer A can ping other addresse local subnet. Computer A sent the first ICMP packet toward computer B with a TTL value of 1. A analyzer that was running on computer B showed that the packet never reached its destination. the packet not reach the destination?T here is a TCP/IP problem on computer A.There is a routing loop between R1 and R2.R1 does not have a route for the destination network.T he TTL for the packet was decreased to zero by R1.32Refer to the exhibit. Host A sends a frame to host C with a destination MAC address CC. Th address for host C is not in the MAC table of switch SW1. How will SW1 handle the frame?S witch SW1 will drop the frame.Switch SW1 will forward the frame to host C.Switch SW1 will flood the frame out all ports.S witch SW1 will flood the frame out all ports except port Fa0/1.33What information is used at each hop to determine where the packet will be forwarded next?the IP packet headert he incoming interfacethe transport layer PDUt he source MAC address34A user sees the command prompt: Router(config-if)# . What task can be performed at this mReload the device.P erform basic tests.Configure individual interfaces.C onfigure individual terminal lines.35Which exhibit shows the interface that is configured by the command, router(config)# interfa 0/0/1?Which combination of connectors will be used to make a straight-through cable when building a T568A standard?对37Which topology divides the collision domain and provides full media bandwidth to the hosts i network?对38Refer to the exhibit. A technician has been asked to test connectivity from PC1 to a remote n Which action will indicate if there is remote connectivity?对39A network administrator is configuring several switches for a network. The switches have sim configurations and only minor differences. The administrator wants to save all commands tha issued on the first switch to a text file for editing. Which transfer option should be selected in HyperTerminal?对40Refer to the exhibit. Which option shows the correct topology given the configuration of Rout 对If an administrator wished to return a router to the default state, what additional step must be tak issuing the command erase start-up config?R eload the device.Issue the command copy running-config start-up config.Perform a show running-config to verify that the file was removed.E nter the interface commands to allow the device to connect to the network.42Which statement is true about router hostnames?A hostname should be unique on each router.A router hostname cannot contain capital letters.A router hostname is configured in privileged executive mode.A router hostname must be created before any other configurations can be added to the43What purpose does a hostname serve on a router?uniquely identifies a router on the internetu sed by routing protocols to identify peer routersprovides device identification to users logging on remotelydetermines the hosts that are allowed to connect to the device44Refer to the exhibit. Which diagram depicts the path through the network that is represented output of the tracert command?对45Which fiber connector supports full-duplex Ethernet?对Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has s message to begin session establishment. What happens next?Host1 sends a segment with the ACK flag = 0, SYN flag = 0 to Host2.H ost1 sends a segment with the ACK flag = 1, SYN flag = 0 to Host2.Host1 sends a segment with the ACK flag = 1, SYN flag = 1 to Host2.Host2 sends a segment with the ACK flag = 0, SYN flag = 1 to Host1.H ost2 sends a segment with the ACK flag = 1, SYN flag = 0 to Host1.Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.47Refer to the exhibit. Which logical topology best describes the exhibited network?s tarringpoint-to-pointb usmesh48Which command can be issued on a PC to determine which TCP/IP ports are in use?tracertnetstatnslookupipconfig /all49Refer to the exhibit. A network technician creates equal-sized subnets of network 192.168.2.the subnet mask 255.255.255.224. If the technician wishes to calculate the number of host a in each subnet by using the formula that is shown in the exhibit, what value will be used for n1234550A user types the enable command. What task can be performed at the privileged EXEC mode?C onfigure the device.Configure individual interfaces.Configure individual terminal lines.Issue show and debug commands.。
CCNA 2 Final Exam Answers V3.1
1. What are two possible reasons a router would not load a valid IOS from flash? (Choose two.)The configuration register is set to 0×2142.The first boot system command executed in the startup configuration file is boot system rom.The configuration register is set to 0×2100.The boot field is set to the hexadecimal number 2.The startup configuration file is missing or corrupt.2. What are two recommended uses of login banners? (Choose two.)to display security warning messagesto welcome any user to the routerto warn people about misusing privileged EXEC modeto identify circuits and other devices connected to the routerto announce a scheduled system shutdown3.Router A and Router B have been correctly configured to use RIP as a dynamic routing protocol and all intefaces on Router A and Router B are reporting "interface is up, line protocol is up" status. RIP is then configured onRouter C using the following commands:RouterC(config)# router ripRouterC(config-router)# network 192.168.4.0RouterC(config-router)# network 172.16.0.0If no additional routing is configured on Router A, Router B, and Router C, what will be the result?Networks 192.168.12.0/24, 192.168.4.0/24, and 172.16.0.0/16 will be unreachable from Router A.Router A will have no knowledge of network 192.168.12.0/24, but will have routes to networks 192.168.4.0/24 and 172.16.0.0/16.All networks shown in the graphic will be reachable by Router A, Router B, and Router C.Networks 192.168.4.0/24 and 172.16.0.0/16 will be unreachable from Router A and Router B.4. What are the primary functions of a router? (Choose two.) determine the best path for packetsprevent collisions on the network LANregulate flow control between sender and receiverprovide domain name resolutionforward packets to the appropriate interface5. What are some reasons to change the configuration register setting? (Choose two.)to force the system to ignore the configuration file stored in NVRAM to monitor password changesto change the POST sequenceto force the router to boot the IOS from NVRAMto force the system into ROM monitor mode6. A network administrator issues the erase startup-config command on a configured router with the configuration register set to 0×2102 and observes the following output:Erasing the nvram filesystem will remove all files! Continue? [Confirm] [OK]Erase of nvram: completeIf the router unexpectedly loses power after this sequence, what will occur when power is restored?The router will enter ROM monitor mode upon completion of the power-on self test (POST).The router will load the last known valid configuration file.The router will enter Rx-boot mode.The router will prompt the user to enter setup mode or to continue without entering setup mode.7. Why are routed protocols important to networking? (Choose two.) Routed protocols detect collisions and fragments.Routers use routed protocols to calculate the best path to a destination. Routed protocols transport data across the network.The fields and formats used within a packet are defined by routed protocols.Routed protocols are used to configure the metrics used by routing protocols.8. The main router of XYZ company has enough flash and RAM to store multiple IOS images. An administrator wants to upload a second IOS image from a TFTP server to the flash of the router. Which method will accomplish this task?Paste the IOS filename to the command line of the router while in global configuration mode. Press enter. Then issue the copy tftp flash command.Use the setup utility to load the new image to flash.Copy the IOS image file from a TFTP server using the command copy filenameip address flash .Copy the IOS image file from a TFTP server using the command copy tftp flash. When prompted, provide the IP address or name of the TFTP server and the IOS image filename.9.A network administrator has a console connection to the Fremantle router. Pings to Melville are successful, but pings to Cottesloe and Nedlands fail. What could be a first step in troubleshooting the problem?Use an extended ping from Fremantle to each router in the network.Use the show interfaces command from a Telnet session on Melville to check the connection to Cottesloe.Use the traceroute command to discover exactly which link in the network is down.Use the show cdp neighbors detail command from Fremantle to gather information about all Cisco routers in the network.10.Refer to the exhibit. The new security policy for the company allows all IP traffic from the Engineering LAN to the Internet while only web traffic from the Marketing LAN is allowed to the Internet. Which ACL can be applied in the outbound direction of Serial 0/1 on the Marketing router to implement the new security policy?access-list 197 permit ip 192.0.2.0 0.0.0.255 anyaccess-list 197 permit ip 198.18.112.0 0.0.0.255 any eq wwwaccess-list 165 permit ip 192.0.2.0 0.0.0.255 anyaccess-list 165 permit tcp 198.18.112.0 0.0.0.255 any eq wwwaccess-list 165 permit ip any anyaccess-list 137 permit ip 192.0.2.0 0.0.0.255 anyaccess-list 137 permit tcp 198.18.112.0 0.0.0.255 any eq wwwaccess-list 89 permit 192.0.2.0 0.0.0.255 anyaccess-list 89 permit tcp 198.18.112.0 0.0.0.255 any eq www11.Hosts from the Limerick LAN are not allowed access to the Shannon LAN but should be able to access the Internet. Which set of commands will create a standard ACL that will apply to traffic on the Shannon router interface Fa0/0 implementing this security?access-list 42 deny 172.19.123.0 0.0.0.255 192.0.2.0 0.0.0.255 access-list 42 permit anyaccess-list 56 deny 172.19.123.0 0.0.0.255access-list 56 permit anyaccess-list 61 deny 172.19.123.0 0.0.0.0access-list 61 permit anyaccess-list 87 deny ip any 192.0.2.0 0.0.0.255access-list 87 permit ip any12. Which of the following commands will correctly configure an extended ACL? (Choose two).Router(config)# access-list 18 permit tcp host 192.168.73.3 eq 25Router(config)# access-list 102 permit tcp 10.43.0.0 0.0.255.255 any eq 80Router(config)# access-list 187 permit tcp host 192.168.42.34 172.29.0.0 0.0.255.255 eq 23Router(config)# access-list 99 permit host 10.217.32.3Router(config)# access-list 128 permit tcp host 192.168.100.31 eq 2313. What are the results of setting the boot field bits in the configuration register to "0000"? (Choose two.)The startup-config file will be ignored at bootup.The router will load the IOS from Flash.The router will enter ROM monitor mode upon reload.The router will enter boot ROM mode and have limited capabilities. The administrator can enter the b command to manually boot the IOS.14.Refer to the exhibit. Router D interface S0 on has gone down. What is the maximum time that will elapse before Router A learns that network 168.58.14.0 is down?5 seconds13 seconds17 seconds25 seconds30 seconds77 seconds15. During initial router bootup the following line appears: "NVRAM invalid, possibly due to write erase."What are two possible reasons for this result? (Choose two.)The startup-config file was not saved to RAM before reboot.The IOS has been erased.The router has not been configured.The startup-config file cannot be located.The router will not enter initial configuration dialog.16.The Suffolk router is directly connected to the networks shown in the graphic and has a default route that points to the Richmond router. All interfaces are active and properly addressed. However, when the workstation on network 172.29.5.0/24 sends a packet to destination address 172.29.198.5, it is discarded by the Suffolk router. What can be a reason for this result?The ip classless command is not enabled on the Richmond router.The route was ignored if the Richmond router did not include the 172.29.198.0/24 network in its routing updates.The Richmond router is in a different autonomous system than the Suffolk router.The ip subnet-zero command was not configured on the Suffolk router.The ip classless command is not enabled on the Suffolk router.17. access-list 199 deny tcp 178.15.0.0 0.0.255.255 any eq 23 access-list 199 permit ip any anyAssuming this ACL is correctly applied to a router interface, which statements describe traffic on the network? (Choose two.)All FTP traffic from network 178.15.0.0 will be permitted.All Telnet traffic destined for network 178.15.0.0 will be denied.Telnet and FTP will be permitted from all hosts on network 178.15.0.0 to any destination.Telnet will not be permitted from any hosts on network 178.15.0.0 to any destination.Telnet will not be permitted to any host on network 178.15.0.0 from any destination.18.What facts can be determined from the highlighted text shown in the exhibit? (Choose two.)A weak encryption was applied to all unencrypted passwords.The enable password is now more secure than the enable secret password.An MD5 hashing algorithm was used on all encrypted passwords.Any configured user EXEC mode or Telnet passwords will be encrypted in this configuration.The service password-encryption command was used to encrypt all passwords on the router including enable secret.19. What are three features of CDP? (Choose three.)provides information on directly connected devices that have CDP enabled tests Layer 2 connectivityenabled by default on each interfaceprovides a layer of securityused for debugging Layer 4 connectivity issues20. What information can be learned during the initial router bootup? (Choose two.)the configuration register valuethe number and types of interfaces installedthe router model and the amount of memory that is availablethe amount of memory required to load the IOS and configurationthe number of interfaces with connected cables21.What can be concluded from the output shown in the exhibit? (Choose three.)This is a standard IP access list.This is an extended IP access list.The keyword host is implied in the command line access-list 99 deny 10.213.177.76.The wildcard mask must be configured for this access list to function properly.Host 10.213.177.100 will be allowed access to the Serial0/1 interface.22. Which statements are true regarding setup mode? (Choose three.)Press Ctrl-z to terminate setup mode.Enter a question mark (?) for help at any point.Press Spacebar to accept the default settings.Use setup mode to enter complex protocol features.Press Enter to accept the default settings.Press Ctrl-c to abort configuration dialog.23.Refer to the graphic. Which series of commands will create static routes that will allow Router A and Router B to deliver packets destined for LAN A and LAN B, and direct all other traffic to the Internet?RouterA(config)# ip route 10.90.3.0 255.255.255.0 192.168.3.2RouterB(config)# ip route 192.168.2.0 255.255.255.0 192.168.3.1 RouterB(config)# ip route 0.0.0.0 0.0.0.0 s0/0RouterA(config)# ip route 10.90.3.0 255.255.255.0 192.168.3.2RouterA(config)# ip route 0.0.0.0 0.0.0.0 192.168.3.2RouterB(config)# ip route 192.168.2.0 255.255.255.0 192.168.3.1RouterA(config)# ip route 0.0.0.0 0.0.0.0 192.168.3.2RouterB(config)# ip route 192.168.2.0 255.255.255.0 192.168.3.1 RouterB(config)# ip route 172.20.20.4 255.255.255.252 s0/0RouterA(config)# ip route 0.0.0.0 0.0.0.0 192.168.3.2RouterB(config)# ip route 192.168.2.0 255.255.255.0 192.168.3.1 RouterB(config)# ip route 0.0.0.0 0.0.0.0 s0/024.Which devices can be used to convert the data from a WAN router at the customer site into a form acceptable for use by the WAN service provider? (Choose three.)Ethernet switchDTEmodemhubDCE deviceCSU/DSU25.What will occur when the following ACL is applied inbound to both FastEthernet interfaces of Router A in the graphic?access-list 125 permit tcp 192.168.2.0 0.0.0.255 10.90.3.0 0.0.0.255 eq 23access-list 125 permit tcp 10.90.3.0 0.0.0.255 192.168.2.0 0.0.0.255 eq 23access-list 125 permit tcp 192.168.2.0 0.0.0.255 any eq wwwWorkstations A and B will be able to Telnet to each other. WorkstationA will be allowed to access Web servers on the Internet, while WorkstationB will be denied Internet Web access.Workstations A and B will be able to Telnet to each other. All other traffic will be denied.The ACL will have no effect because it should be applied in the outbound direction on the FastEthernet interfaces.The ACL will deny all traffic because of the implied deny ip any any statement at the end of the ACL.26. Based on this partial output of the show ip route command, which routing protocol is configured on the router?R 172.16.3.0/24 [120/3] via 172.16.2.2, 00:00:27, Serial0/0RIPEIGRPOSPFIGPBGP27.Which of the following are correct statements verified by the router output shown in the graphic? (Choose two.)Layer 3 connectivity exists between BigCity and the devices in the Device ID column.Layer 2 connectivity exists between BigCity and the devices in the Device ID column.All devices shown in the Device ID column use the TCP/IP protocol suite.All devices shown in the Device ID column can be pinged from BigCity.All devices listed in the Device ID column are directly connected to BigCity.28. A network administrator must configure a FastEthernet interface with an IP address. The configuration must also identify the remote site to which the interface is connected. Which set of commands will meet these requirements?StPetersburg(config)# banner San Jose T1StPetersburg(config)# interface fa0/0StPetersburg(config-if)# ip address 172.26.155.5 255.255.255.252StPetersburg(config)# interface fa0/0StPetersburg(config-if)# ip address 172.26.155.5 netmask255.255.255.252StPetersburg(config-if)# description San Jose T1StPetersburg(config)# interface fa0/0StPetersburg(config-if)# ip address 172.26.155.5 255.255.255.252 StPetersburg(config-if)# banner remote site San Jose T1StPetersburg(config)# interface fa0/0StPetersburg(config-if)# ip address 172.26.155.5 255.255.255.252 StPetersburg(config-if)# description San Jose T129. What are the features of a serial interface on a router? (Choose two.) enabled by defaultassigned a unique MAC addressmust be configured as a DCE in lab and production environmentsmust be configured with the default clock rate of 56000may be administratively enabled by using the no shutdown commandmust be configured with a valid IP address and subnet mask in order to forward packets30. Assuming the following ACL is correctly applied to a router interface, what can be concluded about this set of commands? (Choose two.) Router(config)# access-list 165 deny tcp 192.28.115.0 0.0.0.255 172.20.0.0 0.0.255.255 eq 23Router(config)# access-list 165 permit ip any anyThis is a standard IP access list that denies network 192.28.115.0 Telnet access to the 172.20.0.0 network.All Telnet traffic destined for 172.20.0.0 from any network will be denied access.Network 192.28.115.0 is denied Telnet access to the 172.20.0.0 network. Network 172.20.0.0 is denied Telnet access to the 192.28.115.0 network.All FTP and HTTP traffic destined for 172.20.0.0 will be permitted access.31. Which two steps describe how to create a functional physical connection between a router console and a terminal? (Choose two.)Use a crossover cable to connect the terminal serial port to the router console port.Use a rollover cable to connect the terminal NIC to the router console port.Use an RJ-45 to DB-9 adapter on the terminal serial port to connect to the cable going to the router console.Use a transceiver to connect a straight-through cable to the router console port.Use a straight-through cable to connect the router console port to the terminal NIC.Use a rollover cable to connect from a terminal serial port to the router console port.32. What critical information about the status of the router can be found in the outputs of both the show interfaces and show protocols commands? (Choose two.)the Layer 3 address of each configured interfacethe routing protocol configured to forward updates out of each interface the operational status of each interfacetraffic statistics for each interfacewhether the interface is configured as a DTE or DCE33.The following access list has been created to prevent traffic from the 192.0.2.63 host on the Sales LAN from accessing servers and hosts on the Payroll LAN.access-list 26 deny host 192.0.2.63access-list 26 permit anyRefer to the exhibit. Which group of commands will properly place the access list so that only the host on the Sales LAN is denied access to the 172.29.7.0 network but all other traffic is permitted?Payroll(config)# interface fa0/0Payroll(config-if)# ip access-group 26 outPayroll(config)# interface fa0/1Payroll(config-if)# ip access-group 26 outSales(config)# interface fa0/1Sales(config-if)# ip access-group 26 inSales(config)# interface fa0/0Sales(config-if)# ip access-group 26 out34.Refer to the exhibit. Assuming default metrics are used and the networkis fully converged, which path will RIP use to send a packet from Router A to Router F?A, D, E, FA, B, D, E, FA, C, D, E, G, FA, B, D, E, G, F35.Refer to the graphic. Communication is needed between the LAN connected to the fa0/0 interface of the Kansas router and the fa0/0 interface of the Maine router. All hosts on those LANs also need connectivity to the Internet. Which commands will allow this communication? (Choose three).Kansas(config)# ip route 192.168.6.0 255.255.255.0 172.18.64.2Kansas(config)# ip route 192.168.6.0 255.255.255.0 s0/1Kansas(config)# ip route 0.0.0.0 0.0.0.0 s0/1Maine(config)# ip route 192.168.6.0 255.255.255.0 172.18.64.1Maine(config)# ip route 0.0.0.0 0.0.0.0 s0/1Maine(config)# ip route 172.16.32.0 255.255.255.0 172.18.64.236. Why are interface descriptions used in router configurations? (Choose three).to enable support personnel to easily identify networks and customers that may be affected by a possible interface issueto provide comments on the interface without affecting the router functionalityto display access warning messages before users enter the interface configuration modeto eliminate the need to use IP addresses when using the ping and telnet commandsto identify the purpose and location of the interface37.A network administrator has enabled RIP on routersB andC in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?A(config)# router ripA(config-router)# passive-interface S0/0B(config)# router ripB(config-router)# network 192.168.25.48B(config-router)# network 192.168.25.64A(config)# router ripA(config-router)# no network 192.168.25.32B(config)# router ripB(config-router)# passive-interface S0/0A(config)# no router rip38. What could a Cisco support technician learn from the IOS filename c2600-d-mz.121-3? (Choose three.)the format of the filethe RAM memory requirements of the filethe version number of the filethe size of the filethe device platform of the file39.While planning an IOS upgrade, the administrator issues the show version command. Based on the output in the graphic, what is the current IOS boot location?RAMNVRAMFlashROM40. A new technician must add boot system commands to one of the department routers. Which available commands will the router return as output when the command shown below is entered? (Choose two.)Router(config)# boot system ?RAMNVRAMIOSIP AddressTFTPFLASH41. From the running-config, the following configuration entries are displayed:Router(config)# line vty 0 2Router(config-line)# password g8k33prRouter(config-line)# loginWhat can be interpreted from the exhibited configuration? (Choose two.)Three Telnet lines are available for remote access.Two Telnet lines are available for remote access.Future configuration of the remaining Telnet lines will require the password to be set to g8k33pr.To login to the remote device, g8k33pr will be used as the Telnet and secret password.Remote access to this local router will require a Telnet password of g8k33pr.42. Which router component stores the information that is displayed by the show running-config command?flashNVRAMRAMROM43. What are two characteristics of the support for Telnet within Cisco IOS software? (Choose two.)Up to five separate Telnet lines are supported by default in standard edition IOS files.For security purposes, Telnet sessions are required to be established from the privileged mode.A router can host simultaneous Telnet sessions.Once established, a Telnet session can remain operational regardless of network status.Telnet tests wireless connectivity and does not require a physical connection between devices to gain remote access.44. Which router components and operations are correctly described? (Choose two.)RAM – stores the ARP cacheNVRAM – store the operating systemROM – stores the backup IOSPOST – verifies the validity of the running-configFlash – executes diagnostics at bootupDRAM – loads the bootstrap45.Given the output shown in the exhibit, in what order and location will the router search for the IOS if no boot system commands are found in the startup-config file?ROM, Flash, TFTP serverFlash, NVRAM, RAMROM, TFTP server, FlashRAM, Flash, NVRAMFlash, TFTP server, ROM46. What can a network administrator do to recover from a lost router password?perform a reload or resettelnet from another router and issue the show running-config command to view the passwordboot the router to ROM monitor mode and configure the router to ignore NVRAM when it initializesboot the router to bootROM mode and enter the b command to load the IOS manually47.Neither router in the exhibit has a host table or DNS available. The interfaces and passwords have been correctly configured. Which of the following commands will initiate a Telnet session? (Choose two.)Tottenham# telnet OxfordTottenham> telnet 198.18.139.1Oxford# connect 198.18.139.0Oxford> connect TottenhamOxford# telnet TottenhamOxford# 198.18.139.248. If a PC does not have network connectivity to a router, which router port can be used to establish communication?consoleEthernetserialVTY。
CCNA2 FINAL (A+B+C套)英文版
CCNA第二学期《Final Examinnation》英文A卷1 What are two functions of a router? (Choose two.)It forwards data packets toward their destination.It forwards the packet to the destination if the TTL value is 0.It changes the destination IP address of data packets before forwarding them to an exit interface. It determines the best path based on the destination MAC address.It acts as an intersection between multiple IP networks.2 Which router component contains a scaled-down version of the IOS that can be used to reload a complete version of the IOS in the event that the IOS becomes damaged or corrupted?ROMFlashSDRAMNVRAM3 Using default settings, what is the next step in the router boot sequence after the IOS loads from flash?Perform the POST routine.Search for a backup IOS in ROM.Load the bootstrap program from ROM.Load the running-config file from RAM.Locate and load the startup-config file from NVRAM.4Refer to the exhibit. How many routes are ultimate routes?34575Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network?ADCABCIt will load balance the traffic between ADC and ABCIt will send the traffic via ABC, and will use ADC as a backup path only when ABC fails.6Refer to the exhibit. Routers R1 and R3 use different routing protocols with default administrative distance values. All devices are properly configured and the destination network is advertised by both protocols.Which path will be used to transmit the data packets from PC1 to PC2?The packets will travel via R2-R1.The packets will travel via R2-R3.The traffic will be load-balanced between two paths — via R2-R1 and via R2-R3.The packets will travel via R2-R3, and the other path via R2-R1 will be retained as the backup path.7Refer to the exhibit. The network is configured for OSPF routing with default settings. The bandwidths have been configured correctly for each link. If the T1 link between router A and router E fails, what path will a packet from router A take to reach the LAN attached to router F when the network has converged?A, B, C, FA, B, C, E, FA, D, G, E, FA, D, G, H, F8 In a lab test environment, a router has learned about network 172.16.1.0 through four different dynamic routing processes. Which route will be used to reach this network?D 172.16.1.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Serial0/0/0O 172.16.1.0/24 [110/1012] via 192.168.200.1, 00:00:22, Serial0/0/0R 172.16.1.0/24 [120/1] via 192.168.200.1, 00:00:17, Serial0/0/0I 172.16.1.0/24 [100/1192] via 192.168.200.1, 00:00:09, Serial0/0/09 Which two statements are true for link-state routing protocols? (Choose two.)Routers that run a link-state protocol can establish a complete topology of the network. Routers in a multipoint network that run a link-state protocol can exchange routing tables. Routers use only hop count for routing decisions.The shortest path first algorithm is used.Split horizon is used to avoid routing loops.10Refer to the exhibit. Which option will provide the configuration that is needed for router R1 to dynamically learn routes to the 192.168.100.16/28, 192.168.100.32/28, and 192.168.100.48/28 subnetworks?with static routeswith a routed protocolwith a routing protocolwith directly connected routes11Refer to the exhibit. What is the meaning of the highlighted value 120?It is the metric that is calculated by the routing protocol.It is the value that is used by the DUAL algorithm to determine the bandwidth for the link.It is the administrative distance of the routing protocol.It is the hold-down time, measured in seconds, before the next update.12 Which statement is true about the metrics used by routing protocols?A metric is a value used by a particular routing protocol to compare paths to remote networks.A common metric is used by all routing protocols.The metric with the highest value is installed in the routing table.The router may use only one parameter at a time to calculate the metric.13 Which routing protocol by default uses bandwidth and delay to calculate the metric of a route? RIPv1RIPv2OSPFEIGRP14 Which three routing metrics are correctly defined? (Choose three.)delay - the link speedreliability - the error rate on a linkload - the amount of traffic on a linkcost - the value to indicate preference for a routehop count - the path selected with the highest bandwidthbandwidth - the amount of time it takes a packet to travel a link15 Which two statements about routing protocols are accurate? (Choose two.)OSPF supports VLSM.RIPv1 supports VLSM.RIPv2 does not have a hop count limit.EIGRP supports discontiguous network designs.RIPv2 does not support discontiguous network designs.16Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which two devices can be used for this? (Choose two.)a CSU/DSU devicea modeman Ethernet switcha huba bridge17 When connecting two devices, which situation would normally require the use of a crossover cable?connecting a host to a switchconnecting a switch to a routerconnecting a switch to a switchconnecting a host to a router console port18Refer to the exhibit. A network administrator has run the show interface command. The output of this command is displayed. What is the first step that is required to make this interface operational?Switch the cable with a known working cable.Issue the no shutdown command on the interface.Configure the interface as a loopback interface.Set the encapsulation for the interface.19 Which port should a terminal emulator be connected to in order to access a router without network connectivity?T1serialconsoleFastEthernet20 Which router mode is accessed by entering the enable command?user EXECprivileged EXECglobal configurationinterface configuration21Refer to the exhibit. When a static IP address is being configured on the host, what address shouldbe used for the default gateway?10.1.1.110.1.1.2172.16.1.1192.168.1.122Refer to the exhibit. The show cdp neighbors command was run on one of the devices as shown. Based on this information, which two facts can be determined? (Choose two.)The command was run on the router.ABCD is a non- CISCO device.Layer 3 connectivity between two devices exists.ABCD supports routing capability.ABCD is connected to the Fa0/0 interface of the neighboring device.23Refer to the exhibit. Which statement is true about the Ethernet interfaces shown in the network?A frame leaves interface Fa0/0 of R1 with the source MAC address as 000C.3010.9260.Hosts on 10.1.1.0/24 will use 172.16.3.1/24 as their default gateway.A packet will not be forwarded between R1 and R2 until the no shutdown command is issued on the Fa0/0 interface of R1.The Fa0/0 interface of R2 could be configured with the IP address 172.16.4.1/24 and still have connectivity on this link.24Refer to the exhibit. Which solution provides the most efficient use of router resources for forwarding traffic between BR and HQ?RIPRIPv2EIGRPstatic routes25Refer to the exhibit. Pings are failing between HostA and HostB. The network administrator discovers that Router1 does not have a route to the 172.16.0.0 network. Assuming Router2 is configured correctly, which two static routes could be configured on Router1 to enable Host A to reach network 172.16.0.0? (Choose two.)ip route 172.16.0.0 255.255.0.0 S0/0ip route 172.16.0.0 255.255.0.0 S0/1ip route 172.16.0.0 255.255.0.0 192.168.0.1ip route 172.16.0.0 255.255.0.0 192.168.0.2ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/0ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/126Refer to the exhibit. How was the OSPF default gateway entry for R2 determined?Default routes are automatically injected by OSPF into all advertisements.A static default gateway route is defined in the configuration of R2.The default-information originate command is applied on R1.The ISP defines the gateway of last resort and automatically passes it to R1 and R2.The ip default-gateway command is applied on R2.27Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will be listed in the R2 routing table?答案：D28Refer to the exhibit. A network administrator configures a static route on router R1 to reach the 192.168.1.0/24 network. Which IP address should be used as the next-hop address in the ip route command?192.168.1.1192.168.2.1192.135.250.1192.135.250.229 Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can a static route entry be altered to accommodate a topology change?Keep the existing static route and configure a new static route with the correct next hop IP address.Negate the existing static route and configure a new static route with the correct next hop IP address.Do nothing. The existing static route will automatically update the next hop entry with the new IP address.Keep the existing static route, reload the router, and configure a new static route with the correctnext hop IP address.30Refer to the exhibit. The entire 192.168.1.0 network has been allocated to address hosts in the diagram. Utilizing VLSM with contiguous address blocks, which set of addresses and prefixes could be used to create an addressing solution with a minimum waste of IP addresses?答案：D31Refer to the exhibit. Which host has a combination of IP address and subnet mask on the same network as Fa0/0 of Router1?host Ahost Bhost Chost D32Refer to the exhibit. If the EIGRP routing protocol is used throughout the network, which IP address and mask prefix should be sent by router R1 to the Edge router as a result of manual summarization of LANs A, B, C, and D?192.168.4.0/20192.168.4.0/22192.168.4.0/24192.168.4.0/2633Refer to the exhibit. Routers RTRA and RTRB are running OSPF. What entry does RTRA add in the routing table when Serial 0/0/0 receives an update about the network that is attached to RTRB? O 172.16.7.0/30 [110/51] via 10.10.10.2, 00:00:25, Serial0/0/0O 172.16.7.16/28 [110/51] via 10.10.10.2, 00:00:25, Serial0/0/0O 172.16.7.0/24 [110/51] via 10.10.10.2, 00:00:25, Serial0/0/0O 172.16.0.0/16 [110/51] via 10.10.10.2, 00:00:25, Serial0/0/034Refer to the exhibit. If RIPv1 is used as the routing protocol throughout the network, what RIPv1 route will router R1 advertise to router R3?10.0.0.010.1.0.010.1.1.010.1.2.035 Which statement correctly describes a feature of RIP?RIP is a link-state routing protocol.RIP uses only one metric—hop count— for path selection.Advertised routes with hop counts greater than 10 are unreachable.Messages are broadcast every 10 seconds.36Refer to the exhibit. The network is using the RIPv2 routing protocol. If network 10.0.0.0 goes down, what mechanism will prevent Router1 from advertising false routing information back to Router2?triggered updatespoison reverseholddown timerssplit horizon37 Which mechanism helps to avoid routing loops by advertising a metric of infinity?route poisoningsplit horizonhold-down timertriggered updates38Refer to the exhibit. When troubleshooting a network, it is important to interpret the output of various router commands. On the basis of the exhibit, which three statements are true? (Choose three.)The missing information for Blank 1 is the command show ip route.The missing information for Blank 1 is the command debug ip route.The missing information for Blank 2 is the number 100.The missing information for Blank 2 is the number 120.The missing information for Blank 3 is the letter R.The missing information for Blank 3 is the letter C.39Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly configured and operational. Both routers are configured to include all connected interfaces in routing updates. R2 is not showing any routes from R1 in the routing table. What is the likely cause?The adjacent interfaces are passive.The distance of 120 exceeds 15 hops.R2 will not accept version 1 updates from R1.Routes are being summarized by R1 but not by R2.40Refer to the exhibit. All routers are configured to use the EIGRP routing protocol with defaultsettings, all routes are advertised on all routers, and the network is fully converged. Which path will the data take to travel between 172.16.1.0/24 and 192.168.100.0/24?It will travel via A, B, and C.It will travel via A, F, E, D, and C.It will travel via A, G, H, and C.The traffic will be load-balanced on all paths.41 Which multicast address does EIGRP use to send hello and updates packets?224.0.0.5224.0.0.6224.0.0.9224.0.0.1042 A router has EIGRP configured as the only routing protocol. In what way might EIGRP respond if there is no feasible successor route to a destination network and the successor route fails?It broadcasts hello packets to all routers in the network to re-establish neighbor adjacencies.It sends queries to adjacent neighbors until a new successor route is found.It immediately sends its entire routing table to its neighbors.It will set the metric for the failed route to infinity.43Refer to the exhibit. EIGRP 1 has been configured on R1. What is the effect of configuring the ip bandwidth-percent eigrp command?The EIGRP bandwidth routing metric will be reduced by 30%.EIGRP 1 protocol traffic will be restricted to 30% of the link bandwidth.Packets that are routed based on EIGRP routing table entries will be limited to 30% of the link bandwidth.EIGRP traffic will be permitted to burst for short periods to 30% above the configured link bandwidth.44Refer to the exhibit. Which two statements are true based on the exhibited output? (Choose two.) All routes are stable.Each route has one feasible successor.The serial interface between the two routers is down.The administrative distance of EIGRP has been set to 50.The show ip eigrp topology command has been run on R1.45Refer to the exhibit. A network designer is testing a prototype of WAN connections. All of therouters in the exhibit are configured for OSPF routing. The design requires that the path between routers A and D through ISP-A is the primary and the path through ISP-B servers as a backup. The designer notices that router A has two equal-cost paths to the LAN on router D. How can the designer correct this problem?Issue a clock rate 2000000 interface command on S0/0/1 of router ISP-B.Change the default OSPF reference bandwidth on router A.Configure two static routes with administrative distances of 10.Use the bandwidth command to change the default bandwidth on the link to router B.46Refer to the exhibit. R1 and R2 are unable to establish an adjacency. What two configuration changes will correct the problem? (Choose two.)Set a lower priority on R2.Configure the routers in the same area.Set a lower cost on R2 compared to R1.Add a backup designated router to the network.Match the hello and dead timers on both routers.47Refer to the exhibit. If the router loopback interfaces, FastEthernet interfaces, and OSPF priorities are configured as shown, which router would win an OSPF DR election?ABCD48 Two routers need to be configured within a single OSPF area. Which two components need to be configured on both routers to achieve this? (Choose two.)the same process IDthe same area IDnetwork addresses and wildcard masksthe same router IDthe same loop back address49Refer to the exhibit. What OSPF network statements are required for the router B to advertise the three networks that are attached?router ospf 1network 10.0.0.0 0.0.0.255 area 0router ospf 1network 10.1.1.0 0.3.255.255 area 0network 10.10.1.0 0.255.255.255 area 0network 10.20.1.0 0.255.255.255 area 0router ospf 1network 10.1.1.0 0.0.0.3 area 0network 10.10.1.0 0.0.255.255 area 0network 10.20.1.0 0.0.255.255 area 0router ospf 1network 10.1.1.0 0.0.0.3 area 0network 10.10.1.0 0.0.0.255 area 0network 10.20.1.0 0.0.0.255 area 050Refer to the exhibit. A network administrator is trying to determine why router JAX has no OSPF routes in its routing table. All routers are configured for OSPF area 0. From the JAX router, the administrator is able to ping its connected interfaces and the Fa0/1 interface of the ORL router but no other router interfaces. What is a logical step that the network administrator should take to troubleshoot the problem?Reboot the routers.Change the OSPF process ID on all of the routers to 0.Check to see if the cable is loose between ORL and JAX.Check to see if CDP packets are passing between the routers.Use show and debug commands to determine if hellos are propagating.CCNA第二学期《Final Examinnation》英文B卷1 A network administrator is in charge of two separate networks that share a single building. What device will be required to connect the two networks and add a common connection to the Internet that can be shared?hubrouteraccess pointEthernet switch2 Which two router component and operation pair are correctly described? (Choose two.)DRAM - loads the bootstrapRAM - stores the operating systemFlash - executes diagnostics at bootupNVRAM - stores the configuration fileROM - stores the backup configuration filePOST - runs diagnostics on hardware modules3 A router boots and enters setup mode. What is the reason for this?The IOS image is corrupt.Cisco IOS is missing from flash memory.The configuration file is missing from NVRAM.The POST process has detected hardware failure.4Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)10.0.0.0/864.100.0.0/16128.107.0.0/16172.16.40.0/24192.168.1.0/24192.168.2.0/245 Which candidate route has the longest match for a packet with a destination address of 10.30.16.48?10.30.0.0/1610.30.15.0/2310.30.16.0/2410.30.16.32/2710.30.16.32/306Refer to the exhibit. Routers R1 and R3 use different routing protocols with default administrative distance values. All devices are properly configured and the destination network is advertised by both protocols.Which path will be used to transmit the data packets from PC1 to PC2?The packets will travel via R2-R1.The packets will travel via R2-R3.The traffic will be load-balanced between two paths — via R2-R1 and via R2-R3.The packets will travel via R2-R3, and the other path via R2-R1 will be retained as the backup path.7 In a complex lab test environment, a router has discovered four paths to 192.168.1.0/24 via the use of the RIP routing process. Which route will be installed in the routing table after the discovery of all four paths?R 192.168.1.0/24 [120/3] via 192.168.110.1, 00:00:17, Serial0/1/0R 192.168.1.0/24 [120/2] via 192.168.200.1, 00:00:17, Serial0/0/0R 192.168.1.0/24 [120/1] via 192.168.100.1, 00:00:17, Serial0/0/1R 192.168.1.0/24 [120/4] via 192.168.101.1, 00:00:17, Serial0/1/18Refer to the exhibit. The router receives a packet that is destined for 192.168.5.79. How will the router handle this packet?It will forward the packet via the FastEthernet0/0 interface.It will forward the packet via the Serial0/0/0 interface.It will forward the packet via the Serial0/0/1 interface.It will drop the packet.9 A network administrator uses the RIP routing protocol to implement routing within an autonomous system. What are two characteristics of this protocol? (Choose two.)It uses the Bellman-Ford algorithm to determine the best path.It displays an actual map of the network topology.It offers rapid convergence in large networks.It periodically sends complete routing tables to all connected devices.It is beneficial in complex and hierarchically designed networks.10 Which two statements are true for link-state routing protocols? (Choose two.)Routers that run a link-state protocol can establish a complete topology of the network. Routers in a multipoint network that run a link-state protocol can exchange routing tables. Routers use only hop count for routing decisions.The shortest path first algorithm is used.Split horizon is used to avoid routing loops.11 Which two statements are true about classless routing protocols? (Choose two.)They can be used for discontiguous subnets.They can forward supernet routes in routing updates.They cannot implement classful routes in routing tables.They use only a hop count metric.They do not include the subnet mask in routing updates.12 Which statement is true regarding routing metrics?All routing protocols use the same metrics.EIGRP uses bandwidth as its only metric.Routers compare metrics to determine the best route.The larger metric generally represents the better path.13 Which routing protocol by default uses bandwidth and delay to calculate the metric of a route? RIPv1RIPv2OSPFEIGRP14 You have been asked to explain converged networks to a trainee. How would you accurately describe a converged network?A network is converged when all routers have formed an adjacency.A network is converged immediately after a topology change has occurred.A network is converged when all routers flush the unreachable networks from their routing tables.A network is converged after all routers share the same information, calculate best paths, and update their routing tables.15Refer to the exhibit. All the routers are properly configured to use the RIP routing protocol with default settings, and the network is fully converged. Router A is forwarding data to router E. Which statement is true about the routing path?Router A will send the data via the A-D-E path that is listed in the routing table.Router A will load-balance the traffic between A-B-E and A-C-E.Router A will determine that all paths have equal metric cost.Router A will send the data through A-D-E and keep A-B-E and A-C-E as the backup paths.16Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which two devices can be used for this? (Choose two.)a CSU/DSU devicea modeman Ethernet switcha huba bridge17 Which component is typically used to connect the WIC interface of a router to a CSU/DSU? V.35 cableRJ-45 adaptercrossover cablestraight-through cable18 Which router mode is accessed by entering the enable command?user EXECprivileged EXECglobal configurationinterface configuration19Refer to the exhibit. What are the effects of the exhibited commands on the router?All passwords are encrypted.Only Telnet sessions are encrypted.Only the enable password is encrypted.Only the enable password and Telnet session are encrypted.Enable and console passwords are encrypted.20Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that interface FastEthernet0/1 is not functioning. Which action will most likely correct the problem with FastEthernet0/1?A clock rate should be added to the interface configuration.The subnet mask should be added to the interface configuration.An interface description needs to be added to the interface configuration.The no shutdown command needs to be added to the interface configuration.21Refer to the exhibit. Which two facts can be derived from this output? (Choose two.)Three network devices are directly connected to Router2.The serial interface between Router2 and Router3 is up.Router1 and Router3 are directly connected.Six devices are up and running on the network.Layer 3 functionality between routers is configured properly.22Refer to the exhibit. Which route in the routing table of R1 will be discarded by its neighboring router?192.168.2.0192.168.3.0192.168.4.0192.168.9.0192.168.10.0192.168.11.023Refer to the exhibit. All interfaces are addressed and functioning correctly. The network administrator runs the tracert command on host A. Which two facts could be responsible for the output of this command? (Choose two.)The gateway for Host A is missing or improperly configured.The gateway for Host B is missing or improperly configured.The entry for 192.168.1.0/24 is missing from the routing table of R1.The entry for 192.168.1.0/24 is missing from the routing table of R2.The entry for 192.168.2.0/24 is missing from the routing table of R1.The entry for 192.168.2.0/24 is missing from the routing table of R2.24 In which situation would a default static route be recommended?when connecting an edge router to the Internetwhen variable length subnet masking is in effectwhen there is more than one valid route for a destination networkwhen a destination network has a larger mask than any routes in the routing table25 What is the advantage of configuring a static route with an exit interface instead of a next-hop address?The router will perform a recursive lookup.This route will automatically be used as the gateway of last resort.The exit interface configuration consumes less router processing time.The exit interface configuration has an administrative distance value of 1.26Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will be listed in the R2 routing table?答案：D27 A static route has been configured on a router. However, the destination network no longer exists. What should an administrator do to remove the static route from the routing table? Change the routing metric for that route.Nothing. The static route will go away on its own.Change the administrative distance for that route.Remove the route using the no ip route command.28Refer to the exhibit. Hosts on the 192.168.1.0 network cannot communicate with hosts on the 172.16.1.1 network. The network administrator has run the show ip route command on R1.What could be the cause of this problem?The FastEthernet interface on R1 is disabled.Autosummarization is enabled on R1.The serial interface S0/0/0 of R1 is administratively down.No static route or routing protocol is configured.29Refer to the exhibit. The users on the local network 172.16.1.0/24 complain that they are unable to connect to the Internet. What step should be taken to remedy the problem?A new static route must be configured on R1 with the R3 serial interface as the next hop.A new default route must be configured on R1 with the R3 serial interface as the next hop.The default route on R2 should be configured with the R3 serial interface as the next hop.The default route on R2 must be replaced with a new static route and the next hop should be the R1 FastEthernet interface.30 A network administrator needs to assign the very last usable IP address in the 172.24.64.0/18 network range to the router interface that serves this LAN. Which IP address should the administrator configure on the interface?172.16.128.154/18172.16.255.254/18172.24.64.254/18172.24.127.254/1831。
CCNA第二学期期末练习题
1如图所示的网络在路由流量时存在问题，怀疑这可能是编址方案所造成。
该图中使用的编址方案存在什么问题？指定给Router1 的Ethernet0 接口的地址是该子网的广播地址。
在Router1 和Router2 之间的串行链路上配置的子网与指定给Router3 上Ethernet0 的子网有重叠。
Router1 的Serial0 接口与Router2 的Serial0 位于不同的子网。
指定给Router2 上Ethernet0 的子网与指定给Router3 上Ethernet0 的子网有重叠。
2 points for Option 22请参见图示。
网络管理员要将一个带有50 台主机的新子网添加至R3。
要保证新子网可获得足够地址，同时尽量减少地址浪费，应为其分配哪个子网地址？192.168.1.0/24192.168.1.48 /28192.168.1.32/27192.168.1.64/262 points for Option 43出现路由环路的两个原因是什么？（选择两项）收敛速度缓慢静态路由配置错误路由通过两种路由协议获知在同一台路由器上同时使用静态路由和动态路由连接到Internet 的路由器上缺少默认路由Option 1 and Option 2 are correct.4下列哪两项是路由器的功能？（选择两项。
）连接多个IP 网络。
通过使用第2 层地址控制数据流。
确定发送数据包的最佳路径。
管理VLAN 数据库。
扩大广播域。
Option 1 and Option 3 are correct.5哪三项是CDP 的特性？（选择三项。
）测试第2 层连通性提供安全层工作在OSI 第2 层和第3 层默认在每个接口上启用用于调试第4 层连通性问题提供关于已启用CDP 的直连设备的信息Option 1, Option 4, and Option 6 are correct.6下列有关路由器上的启动配置的说法，哪两项是正确的？（选择两项）路由器使用启动配置文件来启动POST。
CCNA2final期末考试答案A
ip address 192.168.3.5 255.255.255.252. What additional comma 1.A technician configures the Fa0/0 interface on a router with issued by the technician to activate the interface to forward traffic? Router(config-if)# exitRouter(config-if)# no shutdownRouter(config-if)# clock rateRouter# copy running-config startup-config2Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that inte FastEthernet0/1 is not functioning. Which action will most likely correct the problem with FastEthernet0/1? A clock rate should be added to the interface configuration. The subnet mask should be added to the interface configuration. An interface description needs to be added to the interface configuration. The no shutdown command needs to be added to the interface configuration. 3Refer to the exhibit. A router interface is configured with the command ip address 172.16.3.31 255.255.192.0. Which set o values would allow a computer that is connected to the router interface to communicate with remote networks? A: 172.16.3.254 B: 255.255.192.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.192.0 C: 172.16.3.255 A: 172.16.3.254 B: 255.255.255.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.255.0 C: 172.16.3.1 4Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will b routing table? ssss 5Refer to the exhibit. PC1 is unable to access the Internet. What is the cause of the problem? An incorrect IP address is configured between the two routers. No static route is configured on Router2. A routing loop has occurred. No routing protocol is configured on either of the two routers. Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.) The route to network 172.16.0.0 has an AD of 156160. T he route to network 172.16.0.0 has an AD of 156160. Network 192.168.0.16 can best be reached using FastEthernet0/0. The AD of EIGRP routes has been manually changed to a value other than the default value. Router1 is running both the EIGRP and OSPF routing process. Network 172.17.0.0 can only be reached using a default route. No default route has been configured. 7Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are d are operational and pings are not blocked on this network. Which ping will fail? from R1 to 172.16.1.1 from R1 to 192.168.3.1 from R2 to 192.168.1.1 f rom R2 to 192.168.1.1 from R2 to 192.168.3.1 8Refer to the exhibit. A network administrator has configured OSPF using the following command: network 192.168.1.32 0.0.0.31 area 0Which router interface will participate in OSPF? FastEthernet0/0 FastEthernet0/1 Serial0/0/0 Serial0/0/1 9Refer to the exhibit. The hosts on the R1 LAN are unable to access the Internet. What is incorrectly configured? the IP address of the Fa0/0 interface at R1 the IP address of the S0/0/1 interface at R2 the IP address of the S0/0/0 interface at R1 the subnet mask of the S0/0/1 interface at R2 t he subnet mask of the S0/0/1 interface at R2 10Refer to the exhibit. Host A is having problems accessing server A. All routers have the same EIGRP configuration What should be done so that host A can access server A? Add the command no auto-summary on all routers. Change the network statements to include a wildcard mask. Adjust the EIGRP hello timers to account for the network delay.Add the command eigrp log-neighbor-changes on all routers. Which feature of RIPv2 enables it to function as a classless routing protocol? Subnet masks are included in routing updates. Routing updates are triggered by topology changes. Next-hop addresses are included in routing updates. N ext-hop addresses are included in routing updates. Multicast addresses are used to send routing updates. 12A network administrator must use the subnet 172.16.128.0/18 to create 6 additional subnets each containing up to 2LANs. Which subnet mask should the administrator use to create the new subnets? 255.255.224.0 255.255.240.0 255.255.248.0 255.255.252.0 13A network administrator is in charge of two separate networks that share a single building. What device will be requ two networks and add a common connection to the Internet that can be shared? hub router access point Ethernet switch 14Refer to the exhibit. What needs to be done to allow these two routers to connect successfully? Add a clock rate to S0/0/0 on R1. Add an interface description to S0/0/1 on R2. Change the serial interface on R2 to S0/0/0 so that it matches R1. Change the IP address of S0/0/1 on R2 so that it is in the same subnet as R1. 15In which situation would a default static route be recommended? when connecting an edge router to the Internet when variable length subnet masking is in effect when there is more than one valid route for a destination network when a destination network has a larger mask than any routes in the routing table Refer to the exhibit. A network engineer has run the show version command on R3. Upon rebooting, R3 does not load configuration settings. What could be the cause of this problem? There is insufficient NVRAM. There is insufficient flash memory. The configuration register is not configured with the default setting. The system image file is not located in NVRAM. 17Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this? The IP address of host A is incorrect. The default gateway of host A is incorrect. The Fa0/1 interfaces of the two routers are configured for different subnets. The subnet mask for the Fa0/0 interface of R1 is incorrect. 18Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly c operational. Both routers are configured to include all connected interfaces in routing updates. R2 is not showing an the routing table. What is the likely cause? The adjacent interfaces are passive. The distance of 120 exceeds 15 hops. R2 will not accept version 1 updates from R1.19W hich two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.) authentication link-state advertisements hold-down timers Spanning Tree Protocol split horizon 20Which prompt is used to allow a user to change the IP address of an interface on a router? Router> Router# Router(config)# Router(config-if)# Refer to the exhibit. A network administrator adds this command to router R1: ip route 192.168.2.0 255.255.255.0 S0/0/0 result of adding this command? This route is automatically propagated throughout the network. The traffic for network 172.16.1.0 is forwarded to network 192.168.2.0. A static route is established. The traffic for all Class C networks is forwarded to 172.16.1.2. 22Refer to the exhibit. What information can be determined from the displayed output? EIGRP packets are waiting to be sent to the neighbors. The adjacencies between the routers are yet to be established. The IP address 192.168.10.10 is configured at serial interface S0/0/1 of router R2. Router R2 is receiving hello packets from a neighbor with the IP address 192.168.10.10 via the R2 S0/0/1 inte23Refer to the exhibit. Based on the partial output in the exhibit, why can users establish a console connection to this entering a password? ole line. The login command was not entered on the consThe enable password should be an enable secret password. No username and password combination has been configured. Console connections cannot be configured to require users to provide passwords. 24W hich of the following are primary functions of a router? (Choose two.) packet switching microsegmentation domain name resolution path selection flow control 25Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can altered to accommodate a topology change? Keep the existing static route and configure a new static route with the correct next hop IP address. Negate the existing static route and configure a new static route with the correct next hop IP address. Do nothing. The existing static route will automatically update the next hop entry with the new IP address. Keep the existing static route, reload the router, and configure a new static route with the correct next hop IP Refer to the exhibit. All routers are configured with no auto-summary. All routers have a default route via their Serial0 Router B receives a packet with a destination of 10.16.1.98. What path will the packet take?B-E B-E-D-A B-E-D-A then loop A-D-A until the TTL expires B will immediately drop the packet. There is insufficient information to answer the question. 27Refer to the exhibit. A network administrator is investigating why data packets with destination addresses of 172.16.192.168.10.100 are being dropped instead of being forwarded via the static route as expected. After confirming that ip command has been applied on all routers in the network, what other action should the administrator take to ensure these addresses are forwarded via the static route? Check that all routers are configured with the same autonomous system number. Issue the n ono auto-summary command within the EIGRP configuration of all routers. Issue the n ono passive-interface command within the EIGRP configuration of all routers. Configure the static route to point to the next hop address instead of the outbound interface. 28If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from router try to load the IOS image first? ROM RAM NVRAM flash TFTP server T FTP server 29T wo routers need to be configured within a single OSPF area. Which two components need to be configured on bo this? (Choose two.) the same process ID the same area ID network addresses and wildcard masks the same router ID the same loop back address 30Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (10.0.0.0/8 64.100.0.0/16 128.107.0.0/16 172.16.40.0/24 192.168.1.0/24 192.168.2.0/24 Which candidate route has the longest match for a packet with a destination address of 10.30.16.48? 10.30.0.0/16 10.30.15.0/23 10.30.16.0/24 10.30.16.32/27 10.30.16.32/30 32W hich three statements are true regarding the encapsulation and de-encapsulation of packets when traveling throug (Choose three.) The router modifies the TTL field, decrementing it by one. The router changes the source IP to the IP of the exit interface. The router maintains the same source and destination IP. T he router changes the source physical address to the physical address of the exit interface.The router changes the destination IP to the IP of the exit interface. The router sends the packet out all other interfaces, besides the one it entered the router on. 33Refer to the exhibit. The interfaces of all routers are configured for OSPF area 0. R3 can ping R1, but the two rou establish a neighbor adjacency. What should the network administrator do to troubleshoot this problem? Check if the interfaces of the routers are enabled. Check the hello and dead intervals between the routers. Check the process ID of both routers. Check if CDP is enabled on all the routers. 34W hich mechanism helps to avoid routing loops by advertising a metric of infinity? route poisoning split horizon hold-down timer triggered updates 35o devices Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which tw for this? (Choose two.) a CSU/DSU device a modem an Ethernet switch a hub a bridge 36Why is fast convergence desirable in networks that use dynamic routing protocols? Hosts are unable to access their gateway until the network is converged. Routers will not allow packets to be forwarded until the network is converged. Routers may make incorrect forwarding decisions until the network has converged. Routers will not allow configuration changes to be made until the network has converged. 37Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the ne commands is required to configure a single area OSPF for the networks that are connected to R2? R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config)# router ospf 2R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 1R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.0.0.0 0.0.0.3 area 138Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network? ADC ABC It will load balance the traffic between ADC and ABC It will send the traffic via ABC, and will use ADC as a backup path only when ABC fails. 39W hat are two ways that a router can learn of the paths to destination networks? (Choose two.) updates from other routers DHCP information broadcasts manual configuration of routes ARP requests from connected routers inspection of the destination IP address in data packets updates from the SMTP management information base u pdates from the SMTP management information base 40Refer to the exhibit. The network administrator has run the following command on R1. R1(config)# ip route 192.168.2.0 255.255.255.0 172.16.1.2What is the result of running this command? Traffic for network 192.168.2.0 is forwarded to 172.16.1.2. This route is automatically propagated throughout the entire network. Traffic for all networks is forwarded to 172.16.1.2. The command invokes a dynamic routing protocol for 192.168.2.0. Refer to the exhibit. What is the meaning of the highlighted value 120? It is the metric that is calculated by the routing protocol. It is the value that is used by the DUAL algorithm to determine the bandwidth for the link. It is the administrative distance of the routing protocol. It is the hold-down time, measured in seconds, before the next update. I t is the hold-down time, measured in seconds, before the next update. 42Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statemen how the routers in this topology will respond to this event? Router4 will learn about the failed route 30 seconds later in the next periodic update. Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expiRouter5 immediately flushes the unreachable route from its routing table. Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0. 43 o Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Rout interface in the same network as the serial interface of Router1? IP 172.16.0.18, subnet mask 255.255.255.0 IP 172.16.32.15, subnet mask 255.255.255.240 IP 172.16.0.18, subnet mask 255.255.255.252 IP 172.16.32.18, subnet mask 255.255.255.252 44W hich statement is true about the RIPv1 protocol? It is a link-state routing protocol. It excludes subnet information from the routing updates. It uses the DUAL algorithm to insert backup routes into the topology table. It uses classless routing as the default method on the router. 45Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2? 192.168.1.0/24 192.168.0.0/24 192.168.0.0/22 192.168.1.0/22 Which two statements are true for link-state routing protocols? (Choose two.) Routers that run a link-state protocol can establish a complete topology of the network. Routers in a multipoint network that run a link-state protocol can exchange routing tables. Routers use only hop count for routing decisions. T he shortest path first algorithm is used.Split horizon is used to avoid routing loops. ts the best route and will b 47A router learns about network 192.168.10.128/27 from multiple sources. Which option represenrouting table? S 192.168.10.128/27 [1/0] via 192.168.10.226 R 192.168.10.128/27 [120/2] via 192.168.10.226, 00:00:14, Serial0/0/0 O 192.168.10.128/27 [110/1563] via 192.168.10.226, 00:00:09, Serial0/0/0 D 192.168.10.128/27 [90/21026560] via 192.168.10.226, 00:00:16, Serial0/0/0 48Refer to the exhibit. When all of the commands that are shown in the exhibit are entered at the correct router prom of the router? name cisco router hostname 49W hich statement is true about the metrics used by routing protocols? A metric is a value used by a particular routing protocol to compare paths to remote networks. A common metric is used by all routing protocols. The metric with the highest value is installed in the routing table. The router may use only one parameter at a time to calculate the metric. 50Which two statements are true about the EIGRP successor route? (Choose two.) It is saved in the topology table for use if the primary route fails. It may be backed up by a feasible successor route. It is used by EIGRP to forward traffic to the destination. It is flagged as active in the routing table. After the discovery process has occurred, the successor route is stored in the neighbor table. in the output of the Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shownshow ip rip databa However, upon running the show ip route command, the network administrator sees that the router has installed a dif 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route? Compared to RIP, EIGRP has a lower administrative distance. Compared to EIGRP, RIP has a higher metric value for the route. Compared to RIP, the EIGRP route has fewer hops. Compared to RIP, EIGRP has a faster update timer. 52A network administrator is analyzing routing update behavior on a network that has both EIGRP and OSPF configu Both protocols appear in the output of show ip protocols. However, only EIGRP internal routes appear in the routing The EIGRP protocol has a lower administrative distance than OSPF.。
ccnfinal_eam_ccna第学期期末考试
CCNA1ENetworkFinal Exam- CCNAExploration: 网络基础知识 (版本 4.0)1下列有关网络层编址的陈述中哪三项是正确的?（选择三项。
）网络层编址使用分层式结构。
使用长度为 48 位的地址。
以太网交换机可以使用它来作出转发决定。
它不支持广播。
其使用的编址方法可以识别地址的网络部分。
网络层编址可以区分每台主机。
2请参见图示。
在 PC 上发出所示的命令。
IP 地址代表什么？主机的 IP 地址主机的默认网关主机的主页 IP 地址主机的首选域名服务器网站的 IP 地址。
3哪三个地址属于公有 IP 地址？（选择三项。
）4数据链路层有哪两项功能？（选择两项）分割和记录数据。
在源主机和目的主机上运行的程序之间进行数据交换。
控制数据如何传递到介质中。
生成信号以表示每个帧中的比特。
使用帧头和帧尾封装每个数据包，以便在本地介质中进行传输。
5请参见图示。
主机 A 要访问 Internet。
哪项第 2 层地址和第 3 层地址的组合可以让主机 A 实现此访问？目的 MAC：，默认网关：目的 MAC：，默认网关：目的 MAC：，默认网关：目的 MAC：，默认网关：6下列哪三项是 CSMA/CD 的特征？（选择三项。
）设备会侦听介质，并且仅当无法检测到介质上存在其它信号时才会传输数据。
介质上的所有设备均可侦听所有通信。
设备根据配置的优先级来进行通信。
发生冲突后，引起冲突的设备会优先尝试传输数据。
发生冲突时，所有设备会在一段时间内停止传输数据，该段时间的长度随机决定。
C SMA/CD 使用令牌系统来避免冲突。
7下列哪三个 IPv4 地址代表子网的有效网络地址？（选择三项。
）8请参见图示。
用记号来表示每条介质链路。
用来连接不同设备的正确电缆类型是什么？连接 1 - 直通电缆，连接 2 - 直通电缆，连接 3 - 交叉电缆连接 1 - 直通电缆，连接 2 - 交叉电缆，连接 3 - 全反电缆连接 1 - 交叉电缆，连接 2 - 全反电缆，连接 3 - 直通电缆连接 1 - 交叉电缆，连接 2 - 直通电缆，连接 3 - 交叉电缆连接 1 - 直通电缆，连接 2 - 全反电缆，连接 3 - 交叉电缆9请参见图示。
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路由器获知到的第一条路径仅使用路由器获知到的前两条路径路由器获知到的最后一条路径所有四条路径对于为防止路由环路而通过毒性反转实现的水平分割方法，哪两项叙述正确？（选择两项。
）所有 Cisco IOS 都会默认启用此方法。
会将一个表示无穷大度量的值分配给路由以将其毒化。
将毒化路由更新发回该更新的发送接口。
指示路由器将可能会影响路由的更改保持一段特定的时间。
限制数据包在被丢弃之前能够在网络中传输的跳数。
在两台路由器能够使用 OSPF 形成邻居邻接关系之前必须完成哪两项任务？（选择两项。
）路由器必须选举出指定路由器。
路由器必须在网络类型方面达成一致。
路由器必须使用相同的 dead 时间间隔。
路由器必须交换链路状态请求。
路由器必须交换数据库描述数据包。
下列路由器组件和操作的配对中，哪两项是正确的？（选择两项。
）D RAM - 加载 bootstrapR AM - 存储操作系统闪存 - 启动时执行诊断N VRAM - 存储配置文件R OM - 存储备份配置文件P OST - 运行硬件模块诊断下列关于无类路由协议的陈述，哪两项是正确的？（选择两项。
）无类路由协议可用于不连续子网。
无类路由协议可在路由更新中转发超网路由。
无类路由协议无法在路由表中实施有类路由。
无类路由协议仅使用跳数度量。
无类路由协议的路由更新中不包含子网掩码。
请参见图示。
在图示的其中一台设备上运行了show cdp neighbors命令。
根据此信息，可推断出哪两项结论？（选择两项。
）在路由器上运行了该命令。
A BCD 是一台非 CISCO 设备。
两台设备间存在第 3 层连通性。
A BCD 支持路由功能。
A BCD 连接到相邻设备的 Fa0/0 接口。
请参见图示。
网络连接有三台路由器：R1、R2 和 R3。
图中显示了所有三台路由器的路由。
从该输出可以得到什么结论？R1 和 R3 通过 S0/0/0 接口相连。
R1 S0/0/0 接口的 IP 地址为 10.1.1.2。
R2 S0/0/1 接口的 IP 地址为 10.3.3.2。
R2 连接到 R3 的 S0/0/1 接口。
√D请参见图示。
要完成路由器 R1 与 WAN 之间的连接，可使用下列哪两种设备？（选择两项。
）C SU/DSU 设备调制解调器以太网交换机集线器网桥请参见图示。
根据如图所示的输出，下列哪两项陈述是正确的？（选择两项。
）所有路由都处于稳定状态。
每条路由都有一个可行后继。
两台路由器之间的串行接口关闭。
E IGRP 的管理距离已设置为 50。
R1 上已运行了show ip eigrp topology命令。
一台使用 RIP 路由协议的路由器在路由表中存有到某个网络的路由条目。
后来，路由器收到另一条到同一目的网络的路由条目的更新，且与前者比，该路由跳更新，路由器会采取什么操作？路由器会将更新信息附加到路由表中。
路由器会将路由表中到该网络的路由条目标记为无效。
路由器会用新信息替换现有的路由表条目。
路由器会忽略新的更新。
请参见图示。
网络管理员将此命令添加到路由器 R1：。
添加此命令会产生什么结果？此路由会在网络中自动传播。
建立一条静态路由。
请参见图示。
从突出显示的输出可以得到什么信息？自动总结被禁用。
选B网络使用的是有类路由协议。
请参见图示。
网络管理员从 R3 上成功 ping 通了 R1。
接下来，管理员在 R3 上运行了show cdp neighbors命令。
图中显示了该命令的输出。
输出中缺少 R1 的两个原因是什么？（选择两项。
）R1 和 R3 之间有连通性问题。
R1 的 Fa0/0 接口配置了不正确的 IP 地址。
在 R1 上运行了no cdp run命令。
对 R3 的 Fa0/1 接口运行了no cdp enable命令。
关闭了 R1 的电源。
数据会通过 R3-R2 传输。
数据会通过 R3-R1-R2 传输。
流量会在两条路径（R3-R2 和 R3-R1-R2）间进行负载均衡。
数据会通过 R3-R2 传输，而另一条通过 R3-R1-R2 的路径则会留作备用路径。
请参见图示。
网络管理员运行了show interface命令。
图中显示了该命令的输出。
要让此接口工作，需要采取的第一步是什么？用已知能够正常工作的电缆替换所用电缆。
对接口发出no shutdown命令。
将接口配置为环回接口。
为接口设置封装。
经由 A、B 和 C 传输。
经由 A、F、E、D 和 C 传输。
经由 A、G、H 和 C 传输。
流量会在所有路径上进行负载均衡。
网络管理员在所示网络图中的路由器 B 和 C 上启用了 RIP。
什么命令可防止向路由器 A 发送 RIP 更新？A(config)# router ripA(config-router)# passive-interface S0/0B(config)# router ripB(config-router)#B(config-router)#A(config)# router ripA(config-router)#B(config)# router ripB(config-router)# passive-interface S0/0A(config)# no router rip请参见图示。
下列有关所示网络中快速以太网接口的陈述，哪一项是正确的？帧离开 R1 的接口 Fa0/0，源 MAC 地址为 000C.。
10.1.1除非对 R1 的 Fa0/0 接口发出no shutdown 命令，否则 R1 和 R2 之间不会转发数据包。
请参见图示。
R2 应使用哪个总结地址将其 LAN 网络通告给 R1？请参见图示。
PC1 无法访问 Internet。
此问题的原因是什么？两台路由器之间配置了错误的 IP 地址。
R outer2 上未配置静态路由。
出现了路由环路。
两台路由器上均未配置路由协议。
请参见图示。
所有路由器都配置为运行 RIPv1，并已完全收敛。
R3 会收到下列哪项所述的路由更新？哪种路由协议默认使用带宽和延迟来计算路由的度量？R IPv1R IPv2O SPFE IGRP关于数据包通过路由器传输时的封装和解封的叙述，下列哪三项是正确的？（选择三项。
）路由器修改 TTL 字段，将其值减 1。
路由器将源 IP 更改为送出接口的 IP。
路由器保持相同的源 IP 和目的 IP。
路由器将源物理地址更改为送出接口的物理地址。
路由器将目的 IP 更改为送出接口的 IP。
路由器会从所有接口将数据包转发出去，包括路由器接收数据包时使用的那个接口。
路由器配置了不同版本的 RIP。
R2 不会转发路由更新。
R1 的配置应包含no auto-summary命令。
已超出最大路径数。
请参见图示。
网络管理员从控制台端口访问路由器 R1，以配置一个新连接的接口。
为建立连接并进行必要的配置更改，管理员需要需要输入什么口令？仅需输入 Cisco123 口令仅需输入 Cisco789 口令仅需输入 Cisco001 口令C isco001 和 Cisco789 口令C isco001 和 Cisco123 口令请参见图示。
尽管两台路由器都可以 ping 通其邻居的串行接口，但无法 ping 通其它路由器的以太网接口。
下列关于此网络的说法中哪两项正确？（选择两项两台路由器上的管理距离都设置为 50。
两台路由器上都未运行network 10.1.1.0 命令。
两台路由器上都启用了自动总结。
请参见图示。
网络管理员已使用以下命令配置了 OSPF。
0.0.0.31 area 0哪个路由器接口将参与 OSPF？F astEthernet0/0F astEthernet0/1S erial0/0/0S erial0/0/1R outer1R outer2R outer3R outer4路由器启动时，如果没有boot system命令，则查找 Cisco IOS 的默认顺序是什么？R OM、TFTP 服务器、闪存闪存、TFTP 服务器、ROM 选B闪存、NVRAM、TFTP 服务器R OM、TFTP 服务器、闪存网络管理员需要配置一台路由器，用于在不等价路径上负载均衡流量。
管理员应采用哪一个路由协议？E IGRPO SPFR IPv1R IPv20/1/1下列关于 OSPF Hello 数据包的陈述，哪两项是正确的？（选择两项。
）用于动态发现邻居。
用于维护邻居关系。
用于确定完整的网络拓扑。
与计时器一起用来选举链路速度最快的指定路由器。
用于在相邻接口之间协商正确的参数。
请参见图示。
命令ip route 0.0.0已在路由器 R2 上生效。
此命令会产生哪两项结果？（选择两项。
）会在路由表中更新静态路由。
来自 Internet 的流量会转发给 R2。
该路由会被指定为到路由表中所有未定义的网络的默认路由。
所有广播都会通过 R2 的 S0/0/0 接口转发。
请参见图示。
网络管理员已在 R1 上运行了show ip protocol命令。
从所示的输出可得出什么结论？路由器正在使用 RIPv2。
路由器不会转发路由更新。
路由器会收到两个 RIP 版本的更新。
F astEthernet0/0 接口关闭。
请参见图示。
R1 LAN 中的主机无法访问 Internet。
下列哪项配置有误？R1 Fa0/0 接口的 IP 地址R2 S0/0/1 接口的 IP 地址R1 S0/0/0 接口的 IP 地址R2 S0/0/1 接口的子网掩码请参见图示。
从 R1 能够 ping 通 10.1.1在 R1 处没有最后选用网关。
两台路由器之间的串行接口关闭。
R1 上未配置默认路由。
下列哪两项是路由器的功能？（选择两项。
）连接多个 IP 网络。
通过使用第 2 层地址控制数据流。
确定发送数据包的最佳路径。
管理 VLAN 数据库。
扩大广播域。
请参见图示。
有多少条路由是子路由？1346请参见图示。
所有路由均已通告给所有路由器且均运行正常。
下列有关数据从路由器 A 到路由器 B 传输的路径，哪一项叙述正确？如果采用 EIGRP 的默认配置，数据会在两条路径（A, D, B 和 A, C, B）之间平均分配。
如果采用 RIPv1 的默认配置，数据会在所有路径上进行负载均衡。
如果同时使用 EIGRP 和 OSPF 的默认配置，数据会通过由 OSPF 协议获知的路径发送。
如果采用 RIPv2 的默认配置，数据会在两条路径（A, D, B 和 A, C, D）之间平均分配。
请参见图示。
突出显示的值 120 表示什么意思？路由协议计算出的度量。
D UAL 算法使用该值来确定该链路的带宽。
路由协议的管理距离。
收到下一个更新前的抑制时间，单位为秒。
请参见图示。
当数据包发往哪两个网络时需要路由器执行递归查找？（选择两项。