ccna第二学期练习答案
CCNA第二学期练习答案chapter9
1On a router running EIGRP, what database would maintain a list of feasible successors?routing tableneighbor tabletopology tableadjacency table2Refer to the exhibit. This is the debug output from 2 directly connected EIGRP routers. They forming an adjacency. What is the cause?one router is a non-cisco routerthey have different autonomous-system numbersthey are using difference sequence numbersthey are sending incorrect hello types3Refer to the exhibit. Which command will advertise the 192.168.1.64/30 network but not the 192.168.1.32 network on router A?network 192.168.1.0network 192.168.1.0 255.255.255.0network 192.168.1.64 0.0.0.3network 192.168.1.64 0.0.0.7network 192.168.1.64 0.0.0.2554 What two actions will the EIGRP DUAL FSM take if a link to a network goes down? (Chooseput the route into passive modequery neighbors for a new routesearch routing table for a feasible successorrun the SPF algorithm to find a new successorsearch topology table for a feasible successor5Refer to the exhibit. What is indicated by the P at the beginning of the topology entry?the route is in a stable statethe route is a preferred routeDUAL is searching for a better route to this destinationthe exit interface is in passive mode and EIGRP advertisements are blocked6 In which of the following tables does the EIGRP DUAL algorithm store the primary route to adestination? (Choose two.)routingtopologyneighborpathshortest path7 What information is maintained in the EIGRP topology database for a destination route? (Chthree.)the routing protocolthe feasible distance of the routethe highest cost of the routethe SRTT value for the routethe route cost as advertised by the neighboring routerthe physical address of the gateway interface8 Which of the following statements describes the bounded updates used by EIGRP?Bounded updates are sent to all routers within an autonomous system.Partial updates are sent only to routers that need the information.The updates are sent to all routers in the routing table.Updates are bounded by the routers in the topology table.9 Which of the following types of routes will be denoted by EX in EIGRP routing table entries?two.)routes learned from other routing protocolsroutes learned from any non-adjacent EIGRP routersany route with a hop count metric higher than 224EIGRP routes that originate in different autonomous systemsall passive routes in the routing table10Host 192.168.1.66 in the network illustrated is unable to ping host 192.168.1.130. How must configured to enable connectivity between the two hosts? (Choose two.)R1(config-router)# network 192.168.1.128R1(config-router)# auto-summaryR1(config-router)# no auto-summaryR2(config-router)# no auto-summaryR2(config-router)# auto-summaryR2(config-router)# network 192.168.1.6411 Which two statements describe characteristics of EIGRP? (Choose two.)EIGRP is a distance vector routing protocol.EIGRP supports classless routing and VLSM.EIGRP is classified as a link-state routing protocol.EIGRP uses TCP for reliable delivery of EIGRP update packets.With EIGRP, loop-free paths are achieved through the use of hold-down timers.EIGRP sends a periodic update every 30 minutes.12Refer to the exhibit. Based on the output of show ip eigrp neighbors, what are two possible with adjacencies between Router1 and Router2? (Choose two.)The routers are configured with different EIGRP process IDs.Automatic summarization was disabled.The hello timer for R1 was altered.The serial interfaces for both routers are in different networks.No feasible successors were found.13Refer to the exhibit. In the topology table, what do the numbers 3011840 and 3128695 repre the route metric that is applied to those EIGRP routes for this routerthe trustworthiness of the routing information sourcethe composite of the hop count and bandwidth to that destination networkthe total metric for that network as advertised by the EIGRP neighbor14Refer to the exhibit. EIGRP is the only routing protocol enabled on this network. No static rou configured on this router. What can be concluded about network 198.18.1.0/24 from the exh output?A route to network 198.18.1.0/24 is not listed in the routing table.Packets that are destined for 198.18.1.0/24 will be forwarded to 198.18.10.6.EIGRP will perform equal cost load balancing across two paths when forwarding packets 198.18.1.0/24.The router with interface 172.16.3.2 is a successor for network 198.18.1.0/24.15Refer to the exhibit. All interfaces have been configured with the bandwidths that are shown exhibit. Assuming that all routers are using a default configuration of EIGRP as their routing what path will packets take from the 172.16.1.0/16 network to the 192.168.200.0/24 network A,B,EA,C,EA,D,EPackets will load balance across the A,B,E and A,C,E paths.Packets will load balance across the A,B,E and A,D,E paths.Packets will load balance across the A,C,E and A,D,E paths.16 By default, which two metrics are used by EIGRP to determine the best path between netwoMTUloaddelaybandwidthreliability17 Which term defines a collection of networks under the administrative control of a single entitypresents a common routing policy to the Internet?autonomous systemcontiguous networksprocess IDBGPv18Refer to the exhibit. The company is using EIGRP with an autonomous system number of 10 between hosts on networks that are connected to router A and those that are connected to ro successful. However, users on the 192.168.3.0 network are unable to reach users on the 19 network. What is the most likely cause of this problem?IP classless is enabled and is causing the packet to drop.The command network 192.168.1.32 was not issued on router C.The routers are not configured in the same EIGRP routing domain.Automatic summarization of the networks is causing the subnetted routes to be dropped.19 In the command router eigrp 20, what is the purpose of the number 20?specifies the administrative distance for all EIGRP routesidentifies the autonomous system number this EIGRP process will advertisedetermines what metric is added to all advertised routesindicates the number of addresses in the EIGRP routing domain20 The show ip eigrp topology command output on a router displays a successor route and asuccessor route to network 192.168.1.0/24. In order to reduce processor utilization, what doe do when the primary route to this network fails?The router sends query packets to all EIGRP neighbors for a better route to network192.168.1.0/24.The DUAL FSM immediately recomputes the algorithm to calculate the next backup rout Packets that are destined for network 192.168.1.0/24 are sent out the default gateway in The backup route to network 192.168.1.0/24 is installed in the routing table.。
最新 CCNA第二学期章节测试 第八章 答案
参加考试- ERouting Chapter 8 - CCNA Exploration: 路由协议和概念(版本 4.0) 1请参见图示。
下列哪项陈述能够正确描述该网络？错误！未找该网络使用EIGRP到引用源。
错误！未找至少包含一条父路由和一条子路由到引用源。
错误！未找192.168.2.0、192.168.3.0 和192.168.4.0 网络是子路由到引用源。
错误！未找发往172.16.3.0 的流量将被引导至s 0/0/1到引用源。
2请参见图示。
路由器 B 接收到目的地址为10.16.1.97 的数据包。
路由器 B 将会做什么？错误！未找丢弃数据包到引用源。
错误！未找使用默认路由到引用源。
错误！未找通过到10.16.1.0 的路由转发该数据包到引用源。
错误！未找通过到10.16.1.64 的路由转发该数据包到引用源。
3请参见图示。
Router1 将对172.16.0.0/24 网络的子路由应用什么子网掩码？错误！未找0.0.0.0到引用源。
错误！未找255.255.0.0到引用源。
错误！未找255.255.255.0到引用源。
错误！未找255.255.255.255到引用源。
4请参见图示。
Router1 正在运行IOS 第12.2 版。
网络管理员需要做什么工作才能确保发往172.16.0.0/24 未知子路由的数丢弃？错误！未找使用ip default-network命令到引用源。
错误！未找使用RIPv1 之类的有类路由协议到引用源。
错误！未找启用OSPF 或ISIS 作为路由协议到引用源。
错误！未找使用ip classless命令到引用源。
错误！未找什么都不用做，默认会启用ip classless到引用源。
5路由表中显示以下条目：R 192.168.8.0/24 [120/2] via 192.168.4.1, 00:00:26, Serial0/0/1这是哪种类型的路由？错误！未找1 级父路由到引用源。
CCNA第二学期练习答案chapter1
1Which two statements correctly describe the components of a router? (Choose two.) RAM permanently stores the configuration file used during the boot sequence.ROM contains diagnostics executed on hardware modules.NVRAM stores a backup copy of the IOS used during the boot sequence.Flash memory does not lose its contents during a reboot.ROM contains the most current and most complete version of the IOS.Flash contains boot system commands to identify the location of the IOS.2Which interfaces in the exhibit could be used for a leased line WAN connection? (Choose tw1234563 If a router cannot find a valid configuration file during the startup sequence, what will occur?The startup sequence will reset.The router will prompt the user for a response to enter setup mode.The startup sequence will halt until a valid configuration file is acquired.The router will generate a default configuration file based on the last valid configuration.The router will monitor local traffic to determine routing protocol configuration requiremen4 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 IOS5 What is the default sequence for loading the configuration file?NVRAM, FLASH, ROMFLASH, TFTP,CONSOLENVRAM, TFTP, CONSOLEFLASH, TFTP, ROM6 From what location can a router load the Cisco IOS during the boot process? (Choose two.)RAMTFTP serverNVRAMsetup routineFlash memoryterminal7 Which are functions of a router? (Choose three.)packet switchingextension of network segmentssegmentation of broadcast domainsselection of best path based on logical addressingselection of best path based on physical addressing8 What three processes does a router execute when it receives a packet from one network thadestined for another network? (Choose three.)decapsulates the Layer 3 packet by stripping off the Layer 2 frame headeruses the destination MAC Address in the IP Header to look up the next-hop address in th tableleaves the Layer 2 frame header intact when decapsulating the Layer 3 packetuses the destination IP Address in the IP header to look up the next-hop address in the r tableencapsulates the Layer 3 packet into the new Layer 2 frame and forwards it out the exit iencapsulates the Layer 3 packet into a special Layer 1 frame and forwards it to the exit i 9 The network administrator needs to connect two routers directly via their FastEthernet ports.cable should the network administrator use?straight-throughrollovercross-overserial10Refer to the exhibit. What can be concluded from the output of the running-configuration of a The passwords are encrypted.The current configuration was saved to NVRAM.The configuration that is shown will be the one used on the next reboot.The commands that are displayed determine the current operation of the router.11 Which two statements describe characteristics of load balancing? (Choose two.)Load balancing occurs when a router sends the same packet to different destination netwLoad balancing occurs when the same number of packets are sent over static and dynamLoad balancing allows a router to forward packets over multiple paths to the same destin network.Unequal cost load balancing is supported by EIGRP.If multiple paths with different metrics to a destinations exist, the router cannot support lo balancing.12Refer to the exhibit. What can be concluded from the routing table output in the exhibit? (ChoThis router only has two interfaces.The router interfaces are not operational yet.This router is configured to forward packets to remote networks.The FastEthernet0/0 and Serial0/0/0 interfaces of this router were configured with an IP and the no shutdown command.An IP packet received by this router with a destination address of 198.18.9.1 will be forw of the Serial0/0/0 interface.13The serial connection shown in the graphic needs to be configured. Which configuration com must be made on the Sydney router to establish connectivity with the Melbourne site? (ChooSydney(config-if)# ip address 201.100.53.2 255.255.255.0Sydney(config-if)# no shutdownSydney(config-if)# ip address 201.100.53.1 255.255.255.224Sydney(config-if)# clock rate 56000Sydney(config-if)# ip host Melbourne 201.100.53.214 Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modesinterfaces that can be protected with passwords. (Choose three.)VTY interfaceconsole interfaceEthernet interfacesecret EXEC modeprivileged EXEC moderouter configuration mode15 What is the outcome of entering these commands?R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# loginensures that a password is entered before entering user EXEC modesets the password to be used for connecting to this router via Telnetrequires check123 to be entered before the configuration can be savedcreates a local user account for logging in to a router or switch16Refer to the exhibit. The network administrator has configured the router with the interface IP addresses shown for the directly connected networks. Pings from the router to hosts on the c networks or pings between router interfaces are not working. What is the most likely problem The destination networks do not exist.The IP addresses on the router interfaces must be configured as network addresses and addresses.The interfaces must be enabled with the no shutdown command.Each interface must be configured with the clock rate command.17 A network administrator has just entered new configurations into Router1. Which command sexecuted to save configuration changes to NVRAM?Router1# copy running-config flashRouter1(config)# copy running-config flashRouter1# copy running-config startup-configRouter1(config)# copy running-config startup-configRouter1# copy startup-config running-configRouter1(config)# copy startup-config running-config18Refer to the exhibit. All routers have a route in its routing table to each network that is shown exhibit. Default routes have not been issued on these routers. What can be concluded about packets are forwarded in this network? (Choose two.)If RouterC receives a packet that is destined for 10.5.1.1, it will be forwarded out interfacIf RouterA receives a packet that is destined for 192.168.3.146, it will be forwarded out in S0/0/1.If RouterB receives a packet that is destined for 10.5.27.15, it will be forwarded out interf S0/0/1.If RouterB receives a packet that is destined for 172.20.255.1, it will be forwarded out int S0/0/0.If RouterC receives a packet that is destined for 192.16.5.101, it will be forwarded out int S0/0/1.19 What header address information does a router change in the information it receives from anEthernet interface before information is transmitted out another interface?only the Layer 2 source addressonly the Layer 2 destination addressonly the Layer 3 source addressonly the Layer 3 destination addressthe Layer 2 source and destination addressthe Layer 3 source and destination address20Refer to the exhibit. Host A pings host B. When R4 accepts the ping the Ethernet interface, what two pieces of header information are included? (Choose two.)s ource IP address: 192.168.10.129s ource IP address: BBBB.3333.5677s ource MAC address: 5555.AAAA.6666d estination IP address: 192.168.10.33d estination IP address: 192.168.10.134d estination MAC address: 9999.DADC.123421Refer to the exhibit. After host 2 is connected to the switch on the LAN, host 2 is unable to communicate with host 1. What is the cause of this problem?The subnet mask of host 2 is incorrect.Host 1 and host 2 are on different networks.The switch needs an IP address that is not configured.The router LAN interface and host 1 are on different networks.The IP address of host 1 is on a different network than is the LAN interface of the router.。
CCNA第二学期第二章考试答案
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某些交互式试题可能不显示您的答案。
分项分数：1哪个接口是包含用于管理24 个端口以太网交换机的IP 地址的默认位置？正确响应您的响应VLAN 1Fa0/0Fa0/1连接到默认网关的接口VLAN 99此试题参考以下领域的内容：Routing and Switching Essentials• 2.1.1 使用初始设置配置交换机2下列关于使用全双工快速以太网的陈述中，哪三项是正确的？（请选择三项。
）正确响应您的响应通过双向数据流改善了性能。
由于禁用了设备上的冲突检测功能，因此性能得到了改善。
节点以全双工单向数据流运行。
由于网卡可以检测到冲突，因此性能得到了改善。
全双工快速以太网在两个方向上提供100% 的效率。
由于网卡能更快速地处理帧，因此延迟减少了。
此试题参考以下领域的内容：Routing and Switching Essentials• 2.1.2 配置交换机端口3使用mdix auto 配置命令会对交换机上的以太网接口产生什么影响？正确响应您的响应自动检测双工设置自动检测接口速度自动检测铜电缆类型自动将第一个检测到的MAC 地址分配给接口此试题参考以下领域的内容：Routing and Switching Essentials• 2.1.2 配置交换机端口4在Cisco IOS 软件无法加载的情况下，网络管理员需要哪种类型的电缆将PC 与交换机连接才能恢复它？正确响应您的响应同轴电缆控制台电缆交叉电缆直通电缆因为交换机上没有运行Cisco IOS 软件，所以管理员需要使用控制台电缆将PC 连接到交换机控制台端口，比便将来自PC 的软件转移到交换机。
此试题参考以下领域的内容：Routing and Switching Essentials• 2.1.1 使用初始设置配置交换机5在对连接问题进行故障排除时，网络管理员发现交换机端口状态LED 在绿色和琥珀色之间跳转。
CCNA第二学期答案
.请参见图示。
对于发往的数据包，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？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 Fa0/1ip route4.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 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 的路由表中缺少的条目。
R1 的路由表中缺少的条目。
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。
）运行链路状态协议的路由器可以建立完整的网络拓扑使用最短路径优先算法。
11.请参见图示。
下列关于Router1 路由表的陈述，哪三项是正确的？（选择三项。
）EIGRP 路由的AD 已经手动更改为默认值以外的其它值。
Router1 正同时运行着EIGRP 和OSPF 路由过程尚未配置任何默认路由。
CCNA第二学期练习答案chapter3
1Which two statements correctly describe the concepts of administrative distanc metric? (Choose two.)Administrative distance refers to the trustworthiness of a particular route.A router first installs routes with higher administrative distances.The value of the administarive distance can not be altered by the networkRoutes with the smallest metric to a destination indicate the best path.The metric is always determined based on hop count.The metric varies depending which Layer 3 protocol is being routed, such as2Refer to the exhibit. Which statement correctly describes how R1 will determinepath to R2?R1 will install a RIP route using network A in its routing table because theadministrative distance of RIP is higher than EIGRP.R1 will install a RIP route using network A in its routing table because the pafrom RIP is lower than EIGRP.R1 will install an EIGRP route using network B in its routing table because th administrative distance of EIGRP is lower than RIP.R1 will install an EIGRP route using network B in its routing table because th cost from EIGRP is lower than RIP.R1 will install an EIGRP route and a RIP route in its routing table and load b between them.3 Which two statements are true regarding classless routing protocols? (Choosesends subnet mask information in routing updatessends complete routing table update to all neighborsis supported by RIP version 1allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the sareduces the amount of address space available in an organization4 Which command would the network administrator issue to determine if load balin effect on a router?s how ip protocolss how ip routes how ip interface briefs how ip interface5 Which two conditions would create a setting where the use of a distance-vectorprotocol would be efficient? (Choose two.)the network requires a special hierarchical designfast convergence of the network is crucialthe network is using a hub and spoke topologythe network is using a flat designthere are more than 15 hops between the most distant routers6 What is the purpose of a routing protocol?It is used to build and maintain ARP tables.It provides a method for segmenting and reassembling data packets.It allows an administrator to devise an addressing scheme for the network.It allows a router to share information about known networks with other route It provides a procedure for encoding and decoding data into bits for packet forwarding.7 Which of the following best describes the operation of distance vector routing pThey use hop count as their only metric.They only send out updates when a new network is added.They send their routing tables to directly connected neighbors.They flood the entire network with routing updates.8 What attribute is associated with link-state routing protocols?split horizonpoison reverselow processor overheadshortest-path first calculations9 Why is fast convergence desirable in networks that use dynamic routing protocRouters will not allow packets to be forwarded until the network has converg Hosts are unable to access their gateway until the network has converged.Routers may make incorrect forwarding decisions until the network has conv Routers will not allow configuration changes to be made until the network ha converged.10 Which of the following conditions must be met in order for a network to have conThe routers in the network are operating with dynamic routing protocols.The routers in the network are operating with compatible versions of IOS.The routers in the network are operating with the same routing tables.The routers in the network are operating with consistent routing knowledge.11 Which two statements are true regarding metrics? (Choose two.)RIP uses bandwidth as a metric.OSPF uses delay as a metric.EIGRP uses bandwidth as a metric.OSPF uses cost based on bandwidth as a metric.RIP uses delay as a metric.EIGRP uses hop count only as a metric.12 Which two statements are true regarding the advantages of the use of static routes? (Choosincreased securityreduced effort in configuring routesthe administrator maintains control over routingeasier to implement in a growing networkreduces the chance of routing errorsincreased router resource usage13 The following line of code is displayed in a routing table:R 209.165.201.0/24 [120/2] via 192.168.252.2, 00:00:16, S0/0/0What can be concluded from this output?A packet destined for host 192.168.252.2 will be forwarded out the interface connected t209.165.201.0/24.The value, 120, is used to determine the best path when a router has more than one rou protocol configured for the same destination network.This route was manually configured using the ip route command.192.168.252.2 is an interface on the router that produced this output.14 What will be the result of the following commands?ORL(config)# interface fastethernet 0/0ORL(config-if)# ip address 172.16.3.1 255.255.255.0ORL(config-if)# no shutdownThe 172.16.3.0 network will be routed by any dynamic routing protocol automatically.A routing table entry is made to the 172.16.3.0 network with a code of "C".A static route is required to route traffic to the 172.16.3.0 network.The commands will be saved to the startup-configuration automatically.15 An engineer creates a static route by entering the Router(config)# ip route 10.0.0.0 255.255192.168.1.2 command. What can be concluded about this route?The administrative distance of this route is 1.192.168.1.2 is the address of an interface on this router.This route will display as a directly connected network in the routing table.Packets with a destination IP address of 192.168.1.2 will be forwarded to the 10.0.0.0/24 first.16Refer to the exhibit. Router1 and Router2 are running EIGRP. All interfaces are operational a packets can be forwarded between all networks. What information will be found in the routing Router1?Router1 will have 6 directly connected networks.The administrative distance of the route to network 172.16.0.0 will be 90.The metric for routes to 172.16.0.0 will be 1.The interface that is used to forward packets to 172.16.0.0 will always be the S0/1 interfa 17 The following line of code is present in the routing table:O 10.16.1.0/27 [110/129] via 192.168.1.5, 00:00:05, Serial0/0/1What does the number 129 indicate in this output?The cost for this link has a value of 129.The clock rate on this serial interface is set to 129,000.The next-hop router is 129 hops away from this router.This route has been updated 129 times in this routing table.18 A growing medium-sized manufacturing company recently began to have routing instability iscompany uses static routes and has a mixture of over 30 Cisco and non-Cisco routers. The n administrator has decided to convert the network to dynamic routing. What characteristics of should be considered in this selection process?Distance vector routing protocols, such as RIP, converge more quickly than do link-state protocols.EIGRP can be used on all of the routers in the company.OSPF can be used between the routers.An exterior routing protocol, such as BGP, is recommended for growing companies.19Refer to the exhibit. If RIP is the routing protocol, what is the value metric from router A to network 192.168.5.0/24?345662472420 A router learns two paths with equal metrics to a destination network via the RIP routing protwill the router handle packets to the destination network?The router will install the first route it learned into the routing table.The router will install both routes in the routing table and load balance between the two.The router will put the first route in the routing table, and denote the second route as a ba route.The router will pick the path with the higher bandwidth and will place it in the routing tabl。
CCNA 第二学期 第九章答案
1 哪两项功能描述了访问控制列表的用途？（请选择两项。
）正确响应您的响应ACL 可以根据路由器上的始发 MAC 地址来允许或拒绝流量。
ACL 可以控制主机能够访问网络中的哪些区域。
ACL 可以帮助路由器确定到目的地的最佳路径。
标准 ACL 可限制对特定应用程序和端口的访问。
ACL 提供基本的网络安全性。
2 访问控制列表在企业网络中的可能用途是下列哪两项？（选择两项。
）正确响应您的响应控制路由器接口的物理状态控制调试输出允许通过路由器过滤第 2 层流量降低路由器上的处理负载控制虚拟终端对路由器的访问3 哪两个特征是标准 ACL 和扩展 ACL 共有的特征？（请选择两项。
）正确您的响应响应两者都可以通过使用描述性名称或号码创建。
两类ACL 都可以根据协议类型进行过滤。
两者都包含隐式 deny 作为最终 ACE。
两者都可以通过端口号允许或拒绝特定服务。
两者都可为特定目的主机 IP 地址过滤数据包。
4下列哪项描述了标准 IPv4 ACL 的特点？正确响应您的响应创建它们时可以使用数字，但不可以使用名称。
它们是在接口配置模式下配置的。
可以根据源 IP 地址和源端口对过滤流量进行配置。
它们仅根据源 IP 地址过滤流量。
5网络管理员需要配置标准 ACL，使得只有 IP 地址为 192.168.15.23 的管理员工作站能够访问主要路由器的虚拟终端。
哪两个配置命令可以完成该任务？（请选择两项。
）正确响应您的响应Router1(config)# access-list 10 permit 192.168.15.23 255.255.255.255Router1(config)# access-list 10 permit 192.168.15.23 0.0.0.0Router1(config)# access-list 10 permit 192.168.15.23 255.255.255.0Router1(config)# access-list 10 permit host 192.168.15.23Router1(config)# access-list 10 permit 192.168.15.23 0.0.0.2556哪一个 IPv4 地址范围包含由 172.16.2.0 指定的、与 ACL 过滤器匹配的、通配符掩码为 0.0.1.255 的所有 IP 地址？正确响应您的响应172.16.2.1 到 172.16.3.254172.16.2.1 到172.16.255.255172.16.2.0 到 172.16.3.255172.16.2.0 到 172.16.2.2557如果路由器有两个接口，并且路由 IPv4 和 IPv6 的流量，那么可以在其中创建并应用多少个 ACL？正确响应您的响应12616488通常认为下列哪三项是安置 ACL 的最佳做法？（请选择三项。
CCNA第二学期练习答案chapter5
1Refer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator i show ip route command on router A. What routes would appear in the routing table output i network is converged? (Choose two).R 192.168.2.0/24 [120/1]C 192.168.2.0/24 [120/1]R 10.10.3.0/24 [120/0]C 10.10.3.0/24 [120/1]R 10.10.1.0/24 [120/2]R 10.10.1.0/24 [120/3]2Refer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to c the gateway of last resort?no auto-summaryip default-network 0.0.0.0ip default-gateway 10.0.0.0ip route 0.0.0.0 0.0.0.0 S0/0/13Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network admi configures the command network 10.1.0.0 on Router1. What network will Router1 advertise Router2?10.1.0.0/1610.1.0.0/810.0.0.0/1610.0.0.0/84Which of the following would be the correct command sequence to enable RIP on Router B f connected networks?RouterB# router ripRouterB(router)# network 210.36.7.0RouterB(router)# network 220.17.29.0RouterB(router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 211.168.74.0RouterB(config-router)# network 199.84.32.0RouterB(config)# configure router ripRouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 199.84.32.0RouterB(config-router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 220.17.29.05 Which command will display RIP activity as it occurs on a router?debug ip ripshow ip routeshow ip interfaceshow ip protocolsdebug ip rip configshow ip rip database6 Which command or set of commands will stop the RIP routing process?RouterB(config)# router ripRouterB(config-router)# shutdownRouterB(config)# router ripRouterB(config-router)# network no 192.168.2.0RouterB(config)# no router ripRouterB(config)# router no rip7Refer to the output from the show ip route command. What can be concluded from the outp 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.8 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?31220301209 Which of the following is considered a limitation of RIP v1?RIP v1 does not send subnet mask information in its updates.RIP v1 is not widely supported by networking hardware vendors.RIP v1 consumes excessive bandwidth by multicasting routing updates using a Class DRIP v1 requires enhanced router processors and extra RAM to function effectively.RIP v1 does not support load balancing across equal-cost paths.RIP v1 authentication is complicated and time-consuming to configure.10 What are three characteristics of the RIPv1 routing protocol? (Choose three.)supports the use of VLSMuses hop count as a metricconsiders a metric of 16 as infinityhas an administrative distance of 110 by defaultincludes the destination IP address and subnet mask in routing updatescalculates metrics using the Bellman Ford algorithm11 What will happen if an interface IP address is entered for the address portion of the networkin a RIPv1 configuration instead of a network address?The router will reject the command.A route to the host address will be added to outgoing RIP updates.A route to the host address will be added to the routing table.All interfaces in the same classful network as the configured address will be included in t routing process.12Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unkno traffic must be forwarded to the ISP. What router or set of routers are recommended to have default route and the default-information originate command issued to implement this forw policy?only Router1only the gateway routerall routers in the networkonly the routers with LANs needing Internet access13Refer to the exhibit. All routers are configured with valid interface addresses in the indicated and are running RIPv1. The network is converged. Which routes are present in the routing ta All routers have all routes in their routing table.All routers have all /30 routes, but do not have /24 routes in their routing table.All routers have all /30 routes. Routers A and E also have some of the /24 routes in their table.All routers have all /30 routes. Routers B and D also have some of the /24 routes in their table.Routers A and E have all routes. Routers B and D have only /30 routes in their routing taRouters A and E have only /24 routes. Routers B and D have only /30 routes in their rout 14Refer to the exhibit. A network consists of multiple routers. What can be verified when the sh protocols command is issued on one of the routers in the network?whether all routes in the network have been properly added to the routing tablerouting protocol configuration in use for IP on this routeroperational status of routing protocols in use on all routers in the networkrouting metric of each network that is listed in the routing table15Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator noti the route is still valid in the routing table of Router1. How much longer will it take for Router1 the route invalid by setting the metric to 16?30 seconds90 seconds155 seconds180 seconds255 seconds16 What is the default update period in seconds for the RIP routing protocol?10121520306017Refer to the exhibit. What can be concluded from the routing table output of router B?A static default route has been configured on B.The default-information originate command has been entered on A.All traffic that is destined for 192.168.1.1 will be sent to address 0.0.0.0.Hosts on the 10.16.1.0/27 network have 192.168.1.1 configured as the default gateway a 18 Which two statements are true regarding the characteristics of RIPv1? (Choose two).It is a distance vector routing protocol.It advertises the address and subnet mask for routes in routing updates.The data portion of a RIP message is encapsulated into a TCP segment.The data portion of a RIP message is encapsulated into a UDP segment.It broadcasts updates every 15 seconds.It allows a maximum of 15 routers in the routing domain.19Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 netwo recently added and will only contain end users. What command or set of commands should b on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new net still allowing this new network to be advertised to other routers?Router1(config-router)# no router ripRouter1(config-router)# network 192.168.10.0Router1(config-router)# no network 192.168.10.0Router1(config-router)# passive-interface fastethernet 0/0Router1(config-router)# passive-interface serial 0/0/0。
ccna第二学期练习答案中文
ERouting Chapter 1 - CCNA Exploration: 路由协议和概念(版本4.0)1口令可用于限制对Cisco IOS 所有或部分内容的访问。
请选择可以用口令保护的模式和接口。
（选择三项。
）VTY 接口控制台接口特权执行模式2路由器从相连的以太网接口收到消息后，会更改哪项报头地址，再将消息从另一个接口发送出去？第 2 层源地址和目的地址3请参见图示。
网络管理员已经为路由器连接到直连网络的接口配置了如图所示的IP 地址。
从路由器ping 相连网络上的主机口之间相互ping 都会遭到失败。
此问题最可能的原因是什么？必须使用no shutdown命令启用接口。
4请参见图示。
主机 A ping 主机B。
当R4 收到对以太网接口的ping 时，哪两块报头信息包括在内？（选择两项。
）目的IP 地址：192.168.10.134目的MAC 地址：9999.DADC.12345网络管理员刚把新配置输入Router1。
要将配置更改保存到NVRAM，应该执行哪一条命令？Router1# copy running-config startup-config6您需要配置图中所示的串行连接，必须在Sydney 路由器上发出以下哪条配置命令才能与Melbourne 站点建立连接？（选Sydney(config-if)# ip address 201.100.53.2 255.255.255.0Sydney(config-if)# no shutdownSydney(config-if)# clock rate 560007请参见图示。
从路由器的运行配置输出可得出什么结论？显示的命令决定了路由器的当前运行情况。
8请参见图示。
在主机 2 连接到LAN 上的交换机后，主机2 无法与主机 1 通信。
导致此问题的原因是什么？主机 1 和主机2 位于不同的网络中。
9输入以下命令的作用是什么？R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# login设置通过Telnet 连接该路由器时使用的口令10以下哪一项正确描述了路由器启动时的顺序？加载bootstrap、加载IOS、应用配置11加载配置文件时的默认顺序是怎样的？NVRAM、TFTP、CONSOLE12请参见图示。
CCNA网络学院第二学期 第六章 试题及答案
ERouting Chapter 6 - CCNA Exploration: 路由协议和概念 (版本4.0)1请参见图示。
网络管理员希望尽量减少 Router1 路由表中的条目数量。
管理员应该在该网络上使用什么技术？VLSMCIDR私有 IP 地址有类路由2 C IDR 对网络有哪两项好处？（选择两项。
）缩小路由表大小动态地址分配自动路由重分布减少路由更新流量在有类边界自动总结3在如图所示的网络中，从 C 类地址的主机部分借用了 3 个位。
在这三条点对点链路上，如果不使用VLSM，那么共有多少址没有被使用？341236841804下列哪些项包含在无类路由协议的路由更新中？（选择两项。
）32 位地址下一跳路由器接口子网掩码单播主机地址第 2 层地址5哪三种内部路由协议支持VLSM？（选择三项。
）OSPFRIP v1RIP v2EIGRPBGPSTP6网络管理员可在VLSM 的帮助下实现下列哪一项？在一个自治系统中使用一个子网掩码在相同的IP 地址空间中使用多个子网掩码在整个自治系统中使用IGRP 作为路由协议在自治系统中使用多种路由协议7如图所示，Router1 和Router2 之间新添加的以太网链路需要一个额外的子网。
要为此链路提供最多14 个可用地址同时又地址，应该在该网络上配置哪个子网地址？192.1.1.16/26192.1.1.96/28192.1.1.160/28192.1.1.196/27192.1.1.224/28192.1.1.240/288请参见图示。
下列哪个地址是图中某个子网的广播地址？192.168.4.3/29192.168.4.15/29192.168.4.65/26192.168.4.255/249某路由器的路由表中安装了一条到网络192.168.32.0/20 的总结路由。
该路由总结了哪些网络？192.168.0.0 – 192.168.32.0/24192.168.0.0 – 192.168.47.0/24192.168.32.0 – 192.168.47.0/24192.168.32.0 – 192.168.48.0/24192.168.32.0 – 192.168.63.0/2410请参见图示。
CCNA第二学期练习答案chapter11
1Refer to the exhibit. What does the "O*E2" from the "O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, Serial0/0" line represent?an internal type 2 OSPF route.an external OSPF route at least two hops away.an external OSPF route from two different sources.an external OSPF route that will not increment in cost.a default route.The route was distributed into OSPF from a type 2 router.2Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?211017861.5443 What three parameters must be indentical between OSPF routers in order to form an adjace(Choose three.)area idK-valuesmetric valuehello intervalnetwork typeinterface type4 What does OSPF use to reduce the number of exchanges of routing information in networkslarge numbers of neighbors are present? (Choose two.)root routerbackup root routerdomain routerbackup domain routerdesignated routerbackup designated router5 What does OSPF use to calculate the cost to a destination network?bandwidthbandwidth and hop countbandwidth and reliabilitybandwidth, load, and reliablity6 A fully converged five router OSPF network has been running successfully for several weeksconfigurations have been saved and no static routes are used. If one router looses power an what information will be in its routing table after the configuration file is loaded but before OS converged?All routes for the entire network will be present.Directly connected networks that are operational will be in the routing table.Because the SPF algorithm has not completed all calculations, no routes will be in the taA summary route for all previously learned routes will automatically appear in the routingall LSPs have been received by the router.7Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration st set of statements was entered for router B to generate the exhibited routing table?B(config-router)# network 192.168.1.0 0.0.0.3 area 0B(config-router)# network 10.16.1.0 0.0.0.224 area 0B(config-router)# network 10.16.1.0 255.255.255.224 area 0B(config-router)# network 192.168.1.0 255.255.255.255 area 0B(config-router)# network 10.0.0.0 255.255.255.255 area 08Refer to the exhibit. Which network command or set of sommands will cause OSPF to be en send and receive packets for any R1 interface in the exhibited subnets?R1(config-router)# network 10.0.0.0 0.0.0.0 area 0R1(config-router)# network 0.0.0.0 255.255.255.255 area 0R1(config-router)# network 10.1.0.0 0.0.0.255 area 0R1(config-router)# network 172.16.1.0 0.0.0.3 area 0R1(config-router)# network 10.0.0.0 0.0.255.255 area 0R1(config-router)# network 172.16.0.0 0.255.255.255 area 09Refer to the exhibit. What does the "2" stand for in the router ospf 2 statement?The number 2 is the autonomous system number.The number 2 indicates the number of networks advertised by OSPF.The number 2 identifies this particular instance of OSPF on this router.The number 2 indicates the priority of the OSPF process on this router.10Refer to the exhibit. All routers have been configured with the interface priorities that are sho routers were restarted simultaneously. The results of the DR/BDR election are shown. What concluded about this network?Router C cannot win a DR election under any circumstances.If the link for interface 192.168.1.4 goes down, router B will become the new DR.The highest router ID was most likely determined via an OSPF router-id statement or st If a new router is added with a higher router ID than router D, it will become the DR.11Refer to the exhibit. What configuration statements would give the results that are shown in t of the show ip protocols command?B(config)# int fa0/0B(config-if)# router-id 192.168.1.5B(config)# int lo0B(config-if)# ip address 192.168.1.5B(config)# router ospf 1B(config-router)# router-id 192.168.1.5B (config)# router ospf 1B(config-router)# ip address 192.168.1.512Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete top DR or BDR were not elected in this OSPF network?45671013 What is the default administrative distance for OSPF?9010011011512014Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and interface priorities. Loopback interfaces are not configured and all interfaces are operational.is the DR and router C is the BDR.What happens immediately after the following commands are entered on router A?A(config)# interface fa0/0A(config-if)# ip ospf priority 255A will become the DR. D will become the BDR.A will become the DR. C will remain the BDR.D will remain the DR. A will become the BDR.D will remain the DR. C will remain the BDR.15Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing tab10.0.0.0/24 network?215615641785178716 What range of networks will be advertised in the OSPF updates by the commandRouter1(config-router)# network 192.168.0.0 0.0.15.255 area 100?192.168.0.0/24 through 192.168.0.15/24192.168.0.0/24 through 192.168.15.0/24192.168.15.0/24 through 192.168.31.0/24192.168.15.0/24 through 192.168.255.0/24192.168.16.0/24 through 192.168.255.0/2417Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.1 What steps must the administrator take to accomplish this?shut down the loop back interfaceuse the OSPF router-id 192.168.100.1 commanduse the clear ip ospf process commandnothing, the router-id of Router1 is already 192.168.100.118Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relat developed between Router1 and Router2?A FULL adjacency is formed.A 2WAY adjacency is formed.Router2 will become the DR and Router1 will become the BDR.Both routers will become DROTHERS.19Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no loopback interfaces, what two roles will router B play on each network segment? (Choose tw DR for network 192.168.1.200BDR for network 192.168.1.200DROTHER on 192.168.1.200DR for network 192.168.1.204BDR for network 192.168.1.204DROTHER on network 192.168.1.20420Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor c reveals no neighbors. What is a possible cause?OSPF autonomous system IDs do not match.OSPF process IDs do not match.OSPF network types are identical.OSPF hello or dead timers do not match.21Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of las the other routers in OSPF area 0?RouterB(config)# router ospf 10RouterB(config-router)# gateway-of-last-resort 172.16.6.6RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10RouterB(config-router)# default-information originateRouterB(config)# router ospf 10RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10RouterB(config-router)# redistribute ip default-route22Refer to the exhibit. RouterA, RouterB, and RouterC in the diagram are running OSPF on the interfaces. Router D was just added to the network. Routers are configured with the loopbac interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after Ro added to the network?RouterB takes over as DR and RouterD becomes the BDR.RouterD becomes the BDR and RouterA remains the DR.RouterD becomes the DR and RouterA becomes the BDR.RouterC acts as the DR until the election process is complete.RouterD becomes the DR and RouterB remains the BDR.There is no change in the DR or BDR until either current DR or BDR goes down.23 Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)Elections are always optional.Elections are required in all WAN networks.Elections are required in point-to-point networks.Elections are required in broadcast multiaccess networks.Elections are sometimes required in NBMA networks.24Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings advertise all attached networks. If all of the routers start at the same time, what will be the re DR and BDR elections for this single area OSPF network? (Choose three.)HQ will be DR for 10.4.0.0/16.Router A will be DR for 10.4.0.0/16.HQ will be BDR for 10.4.0.0/16.Router A will be DR for 10.5.0.0/16.Remote will be DR for 10.5.0.0/16.Remote will be BDR for 10.5.0.0/16.25Refer to the exhibit. What must be received between neighbors to prevent the dead time tha in the exhibit from reaching zero?any traffic through the router interfacesrouting database updates hello packetsBPDU packets。
CCNA第二学期练习答案chapter7
1Refer to the exhibit. If all routers are running RIP version 2, why is there nothe 192.168.1.32/27 network?Rip version 2 does not send subnet masks in its updates.Router A is not setup with RIP as a routing protocol.Rip version 2 will auto summarize routes by default.Router B is not setup to advertise the 192.168.1.64/30 network.2Refer to the exhibit. Which command on which router will allow Router1 to lethe 192.168.0.0/20 network?Router1(config)# ip classlessRouter1(config-router)# no passive-interface serial 0/1/1Router2(config-router)# version 2Router2(config-router)# neighbor 10.0.0.23 What are two reasons to implement RIP version 2 rather than RIP version 1two.)RIP version 2 supports VLSM.RIP version 2 supports more than 16 routers.RIP version 2 supports classful (and not classless) routingRIP version 2 supports routing update authentication.RIP version 2 supports multi-areas.RIP version 2 uses the Dijkstra algorithm rather than the Bellman-Ford4 How are RIP v1 and RIP v2 similar to one another? (Choose three.)They both use hop count as a metric.They both have the same metric value for infinite distance.They both broadcast their updates to their neighbors.They both send subnet mask information in their updates.They both provide for authentication of update sources.They both use split horizon to prevent routing loops.5Refer to the exhibit. Routers East and West are configured using RIPv1. Boare sending updates about their directly connected routes. The East routerthe West router serial interface and West can ping the serial interface of EaHowever, neither router has dynamically learned routes from the other. Whlikely the problem?A gateway of last resort is required.Subnetting is not supported by RIPv1.VLSM is not supported by RIPv1.One of the routers needs a clock rate on the serial interface.6Refer to the exhibit. Which command will allow Router2 to learn about the192.168.16.0/28 network?Router1(config)# ip classlessRouter1(config-router)# network 192.168.16.0Router1(config-router)# no passive-interface serial 0/1/1Router2(config-router)# version 2Router2(config-router)# neighbor 10.0.0.27Refer to the exhibit. All routers are running RIP version 2. JAX is configuredadvertise the 10.0.0.0/24 network. CHI is configured to advertise the 172.16network. A network administrator enters the commands shown in the exhibchanges will occur in this network?The JAX router will ignore updates for the 172.16.0.0/16 network due tohorizon issues.The CHI router will install a route to the 192.168.0.0/16 network in its rouThe routing table for CHI will have the 192.168.0.0/16 route but it will hanext to the route.The ORL router will apply a 255.255.0.0 subnet mask to all networks inupdates it forwards.8Refer to the exhibit. A technician needs to add a new loopback interface to tfunctionality and network design. The technician enters the following set ofcommands on the router:Sanford(config)# interface loopback1Sanford(config-if)# ip address 192.168.6.62 255.255.255.252Why does the router respond with an error?The router does not allow loopback interface configurations.This mask can not be used with this class of addresses.Classless routing must be configured before this address can be addedThe network address for Loopback1 overlaps with an already configureaddress.The router is over the limit for the maximum paths that can be providedrouting table.9 What is the maximum network diameter permitted by the default metric of R15 hops16 hops100 hops120 hops255 hops10 What are two functions of the network command used when configuring roprotocols? (Choose two.)identifies which networks will be included in the routing updatesidentifies the hosts addresses that can be summarized in the networkused to list all addresses for remote and local networksdetermines which subnet mask to apply to routing updatesdetermines which interfaces can send and receive routing updates11Refer to the exhibit. What can be concluded from the output shown in the eThe routing table is limited to 2 routes.The LAN interfaces are participating in the routing process.One update has been sent out of each serial interface and 2 have beenThe no auto-summary has not been configured on this router.12 A network administrator has been told that the company IP address infrastrmust adhere to RFC 1918. What three IP address ranges from RFC 1918 cadministrator use on the network? (Choose three.)10.0.0.0/8127.0.0.0/8169.254.0.0/16172.16.0.0/12192.168.0.0/16209.165.201.0/2713Refer to the exhibit. All routers are running RIPv1. What changes will occurrouting table of router B if a loopback interface with an address of 10.16.1.1configured on router B?Routes to the 10.16.1.0/27, 10.16.1.64/27, and 10.16.1.128/27 networkadded.A connected route to the 10.16.1.128/27 network is added.A third route to the 10.0.0.0/8 network with RIPv1 as the source is addeThe 10.0.0.0/8 route is dropped immediately from the routing table after is configured.14 A network administrator installed four new routers that are running RIPv2. Ra boundary router in the RIPv2 network and has a default route configured.network has converged, the network administrator enters Router1(config-rodefault-information originate on Router1. How will this affect the networkprevents Router1 from forwarding updates about networks that are notconnectedcauses all routers in the network to synchronize routing updates with Rforces Router1 to become the primary or designated router (DR) for updpropagates the default route to all routers in the network15Refer to the exhibit. The exhibited network contains a mixture of Cisco androuters. The command debug ip rip was entered on the JAX router. All rourunning the same version of RIP. Router CHI and Router ORL are not ablethe 192.168.1.16/28 network. What is a possible solution to this problem?Enable split horizon in the network.Configure RIPv2 on routers.Add network 192.168.1.0 to the RIP configuration on the JAX router.Configure JAX Fa0/0 as a passive interface.Enable the Serial0/0/0 interface on the JAX router.Change the IP address on the Fa0/0 interface of the JAX router to 192.1 16 What field was added to the RIP message header by RFC 1723 to add supVLSM and CIDR?subnet maskdestination port numberaddress family identifiersource and destination IP addresses17Refer to the exhibit. What effect will the commands that are shown have onupdates for Router1?Only version 2 updates are sent to 255.255.255.255.Only version 2 updates are sent to 224.0.0.9.Both version 1 and version 2 updates are sent to 224.0.0.9.Both version 1 and version 2 updates are sent to 255.255.255.255.18Refer to the exhibit. RIPv1 is configured as the routing protocol for the netwshown. The following commands are used on each router:router ripnetwork 10.0.0.0network 172.16.0.0When this configuration is complete, users on the LAN of each router are uaccess the remote LANs. Why?The network statements are configured incorrectly.A routing loop has been created.RIPv1 is unable to route to discontiguous subnets of a major network.RIPv1 is unable to route networks with a /24 subnet mask.19RIPv2 is the configured routing protocol on the routers in a network. The co Router(config-router)# no version 2 is entered on the routers. What effectentering this command have on routing updates?Subnet masks will be added to the routing updates.Routing updates will be sent out using multicast address 224.0.0.9.Version 1 and 2 updates will be received and the version 2 updates willsent.The RIP routing process will be removed from the router and routing upnot be forwarded.Scoring RuleFor: correctnessof response。
ccna第二学期练习答案
ERouting Chapter 1 - CCNA Exploration: 路由协议和概念(版本 4.0)1 口令可用于限制对Cisco IOS 所有或部分内容的访问。
请选择可以用口令保护的模式和接口。
（选择三项。
）VTY 接口控制台接口特权执行模式2 路由器从相连的以太网接口收到消息后，会更改哪项报头地址，再将消息从另一个接口发送出去？第 2 层源地址和目的地址3请参见图示。
网络管理员已经为路由器连接到直连网络的接口配置了如图所示的IP 地址。
从路由器ping 相连网络上的主机口之间相互ping 都会遭到失败。
此问题最可能的原因是什么？必须使用no shutdown命令启用接口。
4请参见图示。
主机 A ping 主机B。
当R4 收到对以太网接口的ping 时，哪两块报头信息包括在内？（选择两项。
）5 网络管理员刚把新配置输入Router1。
要将配置更改保存到NVRAM，应该执行哪一条命令？Router1# copy running-config startup-config6您需要配置图中所示的串行连接，必须在Sydney 路由器上发出以下哪条配置命令才能与Melbourne 站点建立连接？（选Sydney(config-if)#Sydney(config-if)# no shutdownSydney(config-if)# clock rate 560007请参见图示。
从路由器的运行配置输出可得出什么结论？显示的命令决定了路由器的当前运行情况。
8请参见图示。
在主机 2 连接到LAN 上的交换机后，主机2 无法与主机 1 通信。
导致此问题的原因是什么？主机 1 和主机2 位于不同的网络中。
9 输入以下命令的作用是什么？R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# login设置通过Telnet 连接该路由器时使用的口令10 以下哪一项正确描述了路由器启动时的顺序？加载bootstrap、加载IOS、应用配置11 加载配置文件时的默认顺序是怎样的？NVRAM、TFTP、CONSOLE12请参见图示。
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 思科第二学期 v2.0 ERouting Chapter 11 答案
请参见图示。
“O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0”一行中的“O*E2”代表什么含义？内部第2 类OSPF 路由。
距离至少两跳远的外部OSPF 路由。
来自两个不同源的外部OSPF 路由。
不会增加开销的外部OSPF 路由。
默认路由。
该路由是从第2 类路由器分布到OSPF 的。
2 points for Option 4请参见图示。
到10.0.0.0 网络的路由的开销是多少？211017861.5442 points for Option 3为形成邻接关系，OSPF 路由器之间的哪三项参数必须相等？（选择三项。
）区域idK-values度量值hello 间隔网络类型接口类型Option 1, Option 4, and Option 5 are correct.在存在大量邻居的网络中，OSPF 会使用什么来减少路由信息的交换次数？（选择两项。
）根路由器备用根路由器域路由器备用域路由器指定路由器备用的指定路由器Option 5 and Option 6 are correct.OSPF 使用什么来计算到目的网络的开销？带宽带宽和跳数带宽和可靠性带宽、负载和可靠性2 points for Option 1包含五台路由器的完全收敛OSPF 网络已经正常运行数个星期。
所有配置都已保存，而且未使用任何静态路由。
如果其中一台路由器断电并重新启动，那么在配置文件加载之后、OSPF 收敛之前其路由表中包含什么信息？路由表中包含整个网络的所有路由。
路由表中将包含运行中的直连网络。
因为此时SPF 算法尚未完成所有计算，所以路由表中没有路由。
所有以前获知路由的总结路由将自动出现在路由表中，直到路由器接收到所有的LSP。
2 points for Option 2请参见图示。
路由器 A 已针对OSPF 进行了正确的配置。
要生成如图所示路由表，需要在路由器 B 上输入哪条或哪组OSPF 配置语句？B(config-router)# network 192.168.1.0 0.0.0.3 area 0B(config-router)# network 10.16.1.0 0.0.0.224 area 0B(config-router)# network 10.16.1.0 255.255.255.224 area 0B(config-router)# network 192.168.1.0 255.255.255.255 area 0B(config-router)# network 10.0.0.0 255.255.255.255 area 02 points for Option 1请参见图示。
CCNA最新中文版题库第二学期第四单元
1 下列哪两项正确描述了管理距离与度量的概念？（选择两项。
）管理距离是指特定路由的可信度。
理距离是指特定路由的可信度。
路由器会首先添加具有较大管理距离的路由。
由器会首先添加具有较大管理距离的路由。
网络管理员无法更改管理距离的值。
络管理员无法更改管理距离的值。
具有到目的地的最小度量的路由即为最佳路径。
有到目的地的最小度量的路由即为最佳路径。
度量总是根据跳数确定。
量总是根据跳数确定。
度量会根据所采用的第量会根据所采用的第 3 层协议（如层协议（如 IP 或 IPX ）而发生变化。
）而发生变化。
2 下列关于无类路由协议的陈述，哪两项是正确的？（选择两项。
）在路由更新中发送子网掩码信息路由更新中发送子网掩码信息将完整的路由表更新发送给所有邻居完整的路由表更新发送给所有邻居受 RIP 第 1 版支持版支持允许在同一拓扑结构中同时使用许在同一拓扑结构中同时使用 192.168.1.0/30 和 192.168.1.16/28 子网子网减少组织中可用地址空间的大小少组织中可用地址空间的大小3 关于使用静态路由的优点，下列哪两项描述正确？（选择两项。
）安全性更高全性更高配置路由的工作量更少置路由的工作量更少管理员保持对路由的控制理员保持对路由的控制在不断扩展的网络中更容易实施不断扩展的网络中更容易实施降低了路由出错的几率低了路由出错的几率提高了路由资源的使用率高了路由资源的使用率4请参见图示。
如果路由协议为请参见图示。
如果路由协议为 RIP ，那么从路由器，那么从路由器 A 到网络到网络 192.168.5.0/24 的度量值是多少？的度量值是多少？ 3 4 56 624 724 5都运行 EIGRP。
所有接口都正常运行，并且数据包能在所有网络之间转发。
在Router1 请参见图示。
Router1 和Router2 都运行的路由表中可找到下列哪一项信息？的路由表中可找到下列哪一项信息？R outer1 有6 个直连网络。
CCNA网络学院第二学期 第二章 试题及答案
ERouting Chapter 2 - CCNA Exploration: 路由协议和概念 (版本 4.0)1当外发接口不可用时，路由表中的静态路由条目有何变化？该路由将从路由表中删除。
路由器将轮询邻居以查找替用路由。
该路由将保持在路由表中，因为它是静态路由。
路由器将重定向该静态路由，以补偿下一跳设备的缺失。
2 哪两种设备负责将来自 WAN服务提供商的数据转换为路由器可以接受的形式？（选择两项。
）路由器的串行端口调制解调器交换机路由器的以太网端口CSU/DSU 设备DTE 设备3请参见图示。
要使WinterPark 和Altamonte 路由器能够传送来自每个LAN 的数据包并将所有其它流量转到Internet，应命令来配置静态路由？WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 198.18.222.0 255.255.255.255 s0/1WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/04路由器配置有到达每个目的网络的静态路由。
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ERouting Chapter 1 - CCNA Exploration: 路由协议和概念 (版本1口令可用于限制对 Cisco IOS 所有或部分内容的访问。
请选择可以用口令保护的模式和接口。
（选择三项。
）VTY 接口控制台接口特权执行模式2路由器从相连的以太网接口收到消息后，会更改哪项报头地址，再将消息从另一个接口发送出去第 2 层源地址和目的地址3请参见图示。
网络管理员已经为路由器连接到直连网络的接口配置了如图所示的 IP 地址。
从路由器 ping 相连网络上的主机口之间相互 ping 都会遭到失败。
此问题最可能的原因是什么必须使用no shutdown命令启用接口。
4请参见图示。
主机 A ping 主机 B。
当 R4 收到对以太网接口的 ping 时，哪两块报头信息包括在内（选择两项。
）目的 IP 地址：目的 MAC 地址：5网络管理员刚把新配置输入 Router1。
要将配置更改保存到 NVRAM，应该执行哪一条命令Router1# copy running-config startup-config6您需要配置图中所示的串行连接，必须在 Sydney 路由器上发出以下哪条配置命令才能与 Melbourne 站点建立连接（选择三Sydney(config-if)# ip addressSydney no shutdownSydney(config-if)# clock rate 560007请参见图示。
从路由器的运行配置输出可得出什么结论显示的命令决定了路由器的当前运行情况。
8请参见图示。
在主机 2 连接到 LAN 上的交换机后，主机 2 无法与主机 1 通信。
导致此问题的原因是什么主机 1 和主机 2 位于不同的网络中。
9输入以下命令的作用是什么R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# login设置通过 Telnet 连接该路由器时使用的口令10以下哪一项正确描述了路由器启动时的顺序加载 bootstrap、加载 IOS、应用配置11加载配置文件时的默认顺序是怎样的NVRAM、TFTP、CONSOLE12请参见图示。
所有路由器的路由表中都有到达如图所示每个网络的路由。
这些路由器上没有配置默认路由。
以下关于数据包在发方式的结论中，哪两项是正确的（选择两项。
）如果 RouterA 接收到发往的数据包，它将把该数据包从接口 S0/0/1 转发出去。
如果 RouterB 接收到发往 10.5.27.15 的数据包，它将把该数据包从接口 S0/0/1 转发出去。
13关于负载均衡特征的描述，哪两条是正确的（选择两项。
）负载均衡可让路由器通过多条路径将数据包发送到同一的目的网络。
EIGRP 支持不等价负载均衡。
14请参见图示。
从图中的路由表输出可得出什么结论（选择两项。
）此路由器的 FastEthernet0/0 接口和 Serial0/0/0 接口配置了 IP 地址和no shutdown命令。
路由器收到的目的地址为的 IP 数据包后，将从 Serial0/0/0 接口转发出去。
15如果路由器在启动时无法找到有效的配置文件，将发生什么情况路由器将提示用户进行响应，以进入设置模式。
16图中的哪些接口可用于租用线路 WAN 连接（选择两项。
）1417下列哪些是路由器的功能（选择三项。
）分组交换广播域分段根据逻辑编址选择最佳路径18哪两项说法正确描述了路由器的组件（选择两项。
）ROM 含有硬件模块所执行的诊断程序。
重新启动时闪存中的内容不会丢失。
19在启动过程中，路由器可以从哪些位置加载 Cisco IOS（选择两项。
）TFTP 服务器闪存20网络管理员需要通过路由器的 FastEthernet 端口直接连接两台路由器。
应使用哪种电缆交叉电缆21当路由器收到从一个网络发往另一个网络的数据包时，它会执行哪三个过程（选择三项。
）通过解开第 2 层帧报头来解封第 3 层数据包通过 IP 报头中的目的 IP 地址在路由表中查找下一跳地址将第 3 层数据包封装成新的第 2 层帧，并将该帧从送出接口转发出去1当外发接口不可用时，路由表中的静态路由条目有何变化该路由将从路由表中删除。
2哪两种设备负责将来自 WAN 服务提供商的数据转换为路由器可以接受的形式（选择两项。
）调制解调器CSU/DSU 设备3请参见图示。
要使 WinterPark 和 Altamonte 路由器能够传送来自每个 LAN 的数据包并将所有其它流量转到 Internet，应命令来配置静态路由WinterPark(config)# ip route 0.0.0.0Altamonte(config)# ip route s0/14路由器配置有到达每个目的网络的静态路由。
下列哪两种情况需要管理员变更该路由器上配置的静态路由（选择两项。
）目的网络不再存在。
拓扑结构发生变化，导致现有的下一跳地址或送出接口无法访问。
5请参见图示。
在到达 10.0.0.0 网络的路由中，/8 表示什么意思它表示在数据包目的 IP 地址中，从左开始有多少个连续比特位必须与 10.0.0.0 匹配才能使用这条路由。
6网络管理员在 Router1 中输入了以下命令：ip route S0/1/0。
Router1 随后收到发往的数据包。
在路由表中找到最近路由之后，Router1 接下来将如何处理该数据包将该数据包封装到适合该 WAN 链路的帧中，并将其从 S0/1/0 接口转发出去7Router# show interfaces serial 0/1命令的输出显示了如下内容：Serial0/1 is up, line protocol is down.线路协议为 down（关闭）的原因最可能是什么尚未设置时钟频率。
8请参见图示。
公司的网络工程师收到任务，要在两个以太网之间建立连通性，使 10.1.1.0/24 子网上的主机能与子网上的工程师被告知公司路由器只能使用静态路由。
使用下列哪一组命令可以在这两个以太网之间建立连接R1(config)# ip route 10.1.1.09两个独立子网上的主机之间无法通信。
网络管理员怀疑其中一个路由表中缺少路由。
可以使用哪三条命令来帮助排查第 3 层（选择三项。
）pingtracerouteshow ip route10指向下一跳 IP 的静态路由在路由表中会显示怎样的管理距离和度量管理距离为 1，度量为 011以下有关 CDP 和图示的说法中，哪项是正确的路由器 D 上运行的 CDP 会收集有关路由器 A、B、C 和 E 的信息。
默认情况下，路由器 A 将从路由器 B 和 C 接收 CDP 通告。
如果路由器 D 和 E 运行的路由协议不同，那么它们不会交换 CDP 信息。
路由器 E 可以使用 CDP 来识别路由器 B 上运行的 IOS。
12图中的路由器使用如图所示的子网分配。
对 Router3 而言，要将内部网络通告给网云，最有效的路由总结是什么13请参见图示。
为使主机 A 能够连接到网络上的主机 B，应在 Router1 上配置哪种静态路由ip route S0/0/014Router# show cdp neighbors命令会显示下列哪些内容（选择三项。
）平台保持时间本地接口15请参见图示。
根据如图所示的输出，该链路的时钟频率会如何确定DCE 上配置的频率决定了时钟频率。
16请参见图示。
要使和 10.0.0.0 网络之间连通并且无需递归查找，需要使用下列哪两条命令（选择两项。
）A (config)# ip route 10.0.0.0 s 0/1/0B(config)# ip route s 0/0/017请参见图示。
下列哪两条命令会将 10.0.0.0/8 网络的下一跳地址从更改为（选择两项。
）A(config)# no ip route 10.0.0.0ip route 10.0.0.018哪两项说法描述了 CDP 的功能或特点（选择两项。
）它会自动启动，允许设备检测使用 CDP 的直连邻居设备。
它允许系统彼此之间相互了解，而无论它们所配置的网络层协议是否相同。
19通过检查show ip interface brief命令的输出可得到什么信息接口 IP 地址20为什么在创建送出接口为以太网络的静态路由时输入下一跳 IP 地址是明智之举在多路访问网络中，如果没有下一跳地址，路由器将无法确定以太网帧的下一跳 MAC 地址。
21请参见图示。
目的地为网络的数据包会被如何转发Router1 会执行递归查找，数据包将从 S0/0 接口发出。
22哪一个地址可以用来总结从到的所有网络1下列哪两项正确描述了管理距离与度量的概念（选择两项。
）管理距离是指特定路由的可信度。
具有到目的地的最小度量的路由即为最佳路径。
2请参见图示。
下列关于 R1 如何确定与 R2 之间最佳路径的陈述中，哪一项正确R1 会将使用网络 B 的 EIGRP 路由加入路由表，因为 EIGRP 的管理距离比 RIP 小。
3下列关于无类路由协议的陈述，哪两项是正确的（选择两项。
）在路由更新中发送子网掩码信息允许在同一拓扑结构中同时使用和子网4网络管理员可使用下列哪一条命令来确定路由器是否启用了负载均衡show ip route5存在下列哪两个条件时，使用距离矢量路由协议会比较有效（选择两项。
）网络使用的是集中星型拓扑结构网络使用的是平面设计6路由协议有何作用可让路由器之间共享有关已知网络的信息。
7下列哪项说法正确描述了距离矢量路由协议的工作情况将路由表发送给直连的邻居。
8当多个路由协议都有一条通往同一个目的网络的路由时，决定将哪条路由添加到路由表中的依据是什么最小管理距离9为什么快速收敛适合于使用动态路由协议的网络在网络收敛之前，路由器可能会做出不正确的转发决定。
10网络必须满足下列哪项条件，才能称为达到收敛网络中的路由器所了解的路由信息一致。
11下列关于度量的陈述，哪两项是正确的（选择两项。
）EIGRP 使用带宽作为度量。
OSPF 使用基于带宽的开销作为度量。
12关于使用静态路由的优点，下列哪两项描述正确（选择两项。
）安全性更高管理员保持对路由的控制13路由表中显示有下列代码行：R [120/2] via 00:00:16, S0/0/0从该输出中可得出什么结论当路由器针对同一目的网络配置了多个路由协议时，数值 120 用于确定最佳路径。
14以下命令的结果是什么ORL(config)# interface fastethernet 0/0ORL(config-if)# ip addressORL(config-if)# no shutdown将为网络创建一条带有代码“C”的路由表条目。