CCNA第二学期期末考试Eam

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ccna第二学期练习题中文答案..

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 接口控制台接口以太网接口加密执行模式特权执行模式路由器配置模式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？仅第 2 层源地址仅第 2 层目的地址仅第 3 层源地址仅第 3 层目的地址第 2 层源地址和目的地址第 3 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 相连网络上的主机之间相互ping 都会遭到失败。

此问题最可能的原因是什么？目的网络不存在。

路由器接口的IP 地址必须配置为网络地址而非主机地址。

必须使用no shutdown命令启用接口。

每个接口都必须使用clock rate命令配置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。

）源IP 地址：192.168.10.129源IP 地址：BBBB.3333.5677源MAC 地址：5555.AAAA.6666目的IP 地址：192.168.10.33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 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-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)# ip address 201.100.53.1 255.255.255.224Sydney(config-if)# clock rate 56000Sydney(config-if)# ip host Melbourne 201.100.53.27请参见图示。

完整版CCNA测试题库及答案

完整版CCNA测试题库及答案描述载波侦听多路由访问/冲突检测（CSMA/CD）的工作原理。

CSMA/CD是一种帮助设备均衡共享带宽的协议，可避免两台设备同时在网络介质上传输数据。

虽然他不能消除冲突，但有助于极大的减少冲突，进而避免重传，从而提高所的设备的数据传输效率。

区分半双工和全双工通信。

并指出两种方法的需求。

与半双工以太网使用一对导线不同，全双工以太网使用两队导线，全双工使用不同的导线来消除冲突，从而允许同时发送和接收数据，而半双工可接收或发送数据，但不能同时接收和发送数据，且仍会出现冲突。

要使用全双工，电缆两端的设备都必须支持全双工，并配置成一全双模式运行。

描述MAC地址的组成部分以及各部分包含的信息。

MAC（硬件）地址时一种使用十六进制表示的地址，长48位（6B）。

其中前24位（3B）称为OUI（Organizationally Unique Idebtifier,组织唯一表示符），有IEEE分配给NIC制造商；余下的部分呢唯一地标识了NIC识别十进制数对应的二进制值和十六进制值。

用这三种格式之一表示的任何数字都可以转换为其他两种格式，能够执行这种转换对理解IP地址和子网划分至关重要。

识别以太网帧中与数据链路层相关的字段。

在以太网中，与数据链路层相关的字段包括前导码，帧其实位置分隔符，目标MAC地址，源MAC地址，长度或者类型以及帧校验序列。

识别以太网布线相关的IEEE标准。

这些标准描述了各种电缆类型的功能和物理特征，包括（但不限于）10Base2、10Base5和10BaseT。

区分以太网电缆类型及其用途。

以太网电缆分3种：直通电缆，用于将PC或路由器的以太网接口连接到集线器或交换机；交叉电缆。

用于将集线器连接到集线器，集线器连接到交换机，交换机连接到交换机以及PC连接到PC；反转电缆，用于PC和路由器或交换机之间建立控制台连接。

描述数据封装过程及其在分组创建中的作用。

数据封装指的是在OSI模型各层给数据添加信息的过程，也成为分组创建。

ccna第二学期练习答案

c c n a第二学期练习答案(总45页)--本页仅作为文档封面，使用时请直接删除即可----内页可以根据需求调整合适字体及大小--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 相连网络路由器接口之间相互 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 R 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 路由下哪条配置命令才能与 Melbourne 站点建立连接（选择三项）Sydney(config-if)# ip addressSydney(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

CCNA 2 - Module 1If a router cannot find a valid configuration file during the startup sequence, what will occur?The router will prompt the user for a response to enter setup mode.Refer 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 connected networks or pings between router interfaces are not working. What is the most likely problem?The interfaces must be enabled with the no shutdown command.Refer to the exhibit. What can be concluded from the routing table output in the exhibit? (Choose two.) The FastEthernet0/0 and Serial0/0/0 interfaces of this router were configured with an IP address and the no shutdown command.An IP packet received by this router with a destination address of 198.18.9.1 will be forwarded out of the Serial0/0/0 interface.Refer to the exhibit. The frame shown in the exhibit was received by the router. The router interfaces are operational. How will the router process this frame? (Choose two.)The router will change the frame type to one supported by the WAN link before forwarding the frame.The frame was received on the Fa0/0 interface of the router and will be s witched to the S0/0/0 interface.Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.)VTY interfaceconsole interfaceprivileged EX EC modeWhich two statements correctly describe the components of a router? (Choose two.)ROM contains diagnostics executed on hardware modules.Flash memory does not lose its contents during a reboot.Refer 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 LA N 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.Which are functions of a router? (Choose three.)packet s witchingsegmentation of broadcast domainsselection of best path based on logical addressingRefer to the exhibit. A ll routers have a route in its routing table to each network that is shown in the exhibit. Default routes have not been issued on these routers. What can be concluded about how packets are forwarded in this network? (Choose two.)If RouterA receives a packet that is destined for 192.168.3.146, it will be forwarded out interface S0/0/1.If RouterB receives a packet that is destined for 10.5.27.15, it will be forwarded out interface S0/0/1.The serial connection shown in the graphic needs to be configured. Which configuration commands must be made on the Sydney router to establish connectivity with the Melbourne site? (Choose three.) Sydney(config-if)# ip address 201.100.53.2 255.255.255.0Sydney(config-if)# no shutdownSydney(config-if)# clock rate 56000Refer to the exhibit. What can be concluded from the output of the running-configuration of a router? The commands that are dis played determine the current operation of the router.Refer to the exhibit. Host A pings host B. When R4 accepts the ping into the Ethernet interface, what two pieces of header information are included? (Choose two.)destination IP address: 192.168.10.134destination MAC address: 9999.DADC.1234What is the outcome of entering these commands?R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# loginsets the password to be used for connecting to this router via T elnetWhich of the following is the correct flow of routines for a router startup?load bootstrap, load IOS, apply configurationWhat three processes does a router execute when it receives a packet from one network that is destinedfor another network? (Choose three.)decapsulates the Layer 3 packet by stripping off the Layer 2 frame headeruses the destination IP Address in the IP header to look up the next-hop address in the routing tableencapsulates the Layer 3 packet into the new Layer 2 frame and forwards it out the exit interfaceThe network administrator needs to connect two routers directly via their FastEthernet ports. What cable should the network administrator use?cross-overWhich two statements describe characteristics of load balancing? (Choose two.)Load balancing allows a router to forward packets over multiple paths to the same destination network.Unequal cost load balancing is supported by EIGRP.What information about the router and its startup process can be gathered from the output of the show version command? (Choose three.)the last restart methodthe configuration register settingsthe location from where the IOS loadedWhich interfaces in the exhibit could be used for a leased line WAN connection? (Choose two.)14From what location can a router load the Cisco IOS during the boot process? (Choose two.)TFTP serverFlash memoryA network administrator has just entered new configurations into Router1. Which command should be executed to save configuration changes to NVRAM?Router1# copy running-config startup-configWhat is the default sequence for loading the configuration file?NVRAM, TFTP, CONSOLEWhat header address information does a router change in the information it receives from an attached Ethernet interface before information is transmitted out another interface?the Layer 2 source and destination addressCCNA 2 - Module 2Which of the following are displayed by the Router# show cdp neighbors command? (Choose three.)platformholdtimelocal interfaceWhy is it advisable to enter a next-hop IP address when creating a static route whose exit interface is an Ethernet network?In a multi-access network, the router cannot determine the next-hop MAC address for the Ethernet frame without a next-hop address.The output of the Router# show interfaces serial 0/1 command displays the following: Serial0/1 is up, line protocol is down.What is the most likely cause for the line protocol being down?No clock rate has been set.A static route that points to the next hop IP will have what administrative distance and metric in the routing table?administrative distance of 1 and metric of 0Refer to the exhibit. What two commands will change the next-hop address for the 10.0.0.0/8 network from 172.16.40.2 to 192.168.1.2? (Choose two.)A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.2Refer to the exhibit. A company network engineer is assigned to establish connectivity between the two Ethernet networks so that hosts on the 10.1.1.0/24 subnet can contact hosts on the 10.1.2.0/24 subnet. The engineer has been told to use only static routing for these company routers. Which set of commands will establish connectivity between the two Ethernet networks?R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1Refer to the exhibit. Which static route should be configured on Router1 so that hostA will be able to reach hostB on the 172.16.0.0 network?ip route 172.16.0.0 255.255.0.0 S0/0/0Which address can be used to summarize networks 172.16.0.0/24 thru 172.16.7.0/24?172.16.0.0/21Refer to the exhibit. What is the significance of the /8 in the route to the 10.0.0.0 network?It indicates the number of consecutive bits, from the left, in the destination IP address of a packet that must match 10.0.0.0 to use that route.What two devices are responsible for converting the data from the WAN service provider into a form acceptable by the router? (Choose two).a modema CSU/DSU deviceA network administrator enters the following command into Router1: ip route 192.168.0.0 255.255.255.0 S0/1/0. Router1 then receives a packet that is destined for192.168.0.22/24. After finding the recently configured static route in the routing table, what does Router1 do next to process the packet?encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0 interfaceWhich piece of information is available from examining the output of the command show ip interface brief?Interface IP addressWhich of the following is true regarding CDP and the graphic shown?By default, Router A will receive CDP advertisements from routers B and C.Which two statements describe functions or characteristics of CDP? (Choose two.)It starts up automatically and allows the device to detect directly connected neighbor devices that use CDP.It allows systems to learn about each other even if different network layer protocols are configured.Hosts on two separate subnets cannot communicate. The network administrator suspectsa missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)pingtracerouteshow ip routeWhat happens to a static route entry in a routing table when the outgoing interface is not available?The route is removed from the table.The routers in the diagram use the subnet assignments shown. What is the most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud?192.1.1.0/25Refer to the exhibit. How will packets destined to the 172.16.0.0 network be forwarded? Router1 will perform recursive lookup and packet will exit S0/0.A router has one static route configured to each destination network. Which two scenarios would require an administrator to alter the static routes that are configured on that router? (Choose two.)The destination network no longer exists.A topology change occurs where the existing next-hop address or exit interface is not accessible.Refer to the exhibit. Given the output in the exhibit, how would a clock rate be determined for this link?The rate configured on the DCE determines the clock rate.Refer to the exhibit. Which set of commands will configure static routes that will allow the WinterPark and the Altamonte routers to deliver packets from each LAN and direct all other traffic to the Internet?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 s0/1Refer to the exhibit. What two commands are required to provide connectivity betw een the 192.168.1.0 and 10.0.0.0 networks without requiring recursive lookup? (Choose two.)A(config)# ip route 10.0.0.0 255.0.0.0 s 0/1/0B(config)# ip route 192.168.1.0 255.255.255.0 s 0/0/0CCNA 2 - Module 3Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)Administrative distance refers to the trustworthiness of a particular route.Routes with the smallest metric to a destination indicate the best path.Refer to the exhibit. Which statement correctly describes how R1 will determine the best path to R2?R1 will install an EIGRP route using network B in its routing table because the administrative distance of EIGRP is lower than RIP.Which two statements are true regarding classless routing protoc ols? (Choose two.) sends subnet mask information in routing updatesallows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topologyWhich command would the network administrator issue to determine if load balancing is in effect on a router?show ip routeWhich statement is true regarding routing protocols?EIGRP uses DUAL to calculate the shortest path and can be configured to do unequal cost load balancing.Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient? (Choose two.)the network is using a hub and spoke topologythe network is using a flat designWhat is the purpose of a routing protocol?It allows a router to share information about known networks with other rou ters.Which of the following best describes the operation of distance vector routing protocols? They send their routing tables to directly connected neighbors.Which of the following is associated with link-state routing protocols?shortest-path first calculationsWhy is fast convergence desirable in networks that use dynamic routing protocols? Routers may make incorrect forwarding decisions until the network has converged.Which of the following conditions must be met in order for a network to have con verged The routers in the network are operating with consistent routing knowledge.Which two statements are true regarding metrics? (Choose two.)EIGRP uses bandwidth as a metric.OSPF uses cost based on bandwidth as a metric.Which two statements are true regarding the advantages of the use of static routes? (Choose two).increased securitythe administrator maintains control over routingThe 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?The value, 120, is used to determine the best path when a router has more than one routing protocol configured for the same destination network.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 shutdownA routing table entry is made to the 172.16.3.0 network with a code of "C".An engineer creates a static route by entering the Router(config)# ip route 10.0.0.0 255.255.255.0 192.168.1.2 command. What can be concluded about this route?The administrative distance of this route is 1.Refer to the exhibit. Router1 and Router2 are running EIGRP. All interfaces are operational and packets can be forwarded between all networks. What information will be found in the routing table for Router1?The administrative distance of the route to network 172.16.0.0 will be 90.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.A growing medium-sized manufacturing company recently began to have routing instability issues. The company uses static routes and has a mixture of over 30 Cisco and non-Cisco routers. The network administrator has decided to convert the network to dynamic routing. What characteristics of protocols should be considered in this selection process?OSPF can be used between the routers.Refer to the exhibit. If RIP is the routing protocol, what is the value of the metric from router A to network 192.168.5.0/24?3A router learns two paths with equal metrics to a destination network via the RIP routing protocol. How will the router handle packets to the destination network?The router will install both routes in the routing table and load balance between the two.CCNA 2 - Module 4Which event will cause a triggered update?a route is installed in the routing tableThree routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?They will send updates that include only directly connected routes to their directly connected neighbors.What does the RIP holddown timer do?instructs routers to ignore updates, for a specified time or event, about possible inaccessible routesWhich two statements are true regarding the function of the RIPv1 routing updates? (Choose two).updates are broadcast at regular intervalsbroadcasts are sent to 255.255.255.255Which of the following statements are correct about RIP?will send out an update if there is a failure of a linkWhich two statements describe EIGRP? (Choose two.)EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.EIGRP sends a partial routing table update, which includes just routes that have been changed.Which statement is true regarding cisco’s RIP_JITTER variable?It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.Which of the following methods does split horizon use to reduce incorrect routing information?Information learned from one source is not distributed back to that source.The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?route poisoningWhat is the purpose of the TTL field in the IP header?limits the time or hops that a packet can traverse through the network before it should be discardedWhich of the following can exist in a distance vector network that has not converged? (Choose three.)routing loopsinconsistent traffic forwardinginconsistent routing table entriesRefer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)EIGRP only updates affected neighbors.EIGRP updates are partial.Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?The path will be router A -> router D -> router E.Which three routing protocols are distance vector routing proto cols? (Choose three).RIPv1EIGRPRIPv2What is a routing loop?a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destinationWhich two conditions are most likely to cause a routing loop? (Choose two.)inconsistent routing tablesincorrectly configured static routesWhat metric does the RIP routing protocol consider to be infinity?16What does a router running RIP do first with a new route that is received from an advertisement?adjusts the metric for the new route to show the added distance for the routeRefer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?3CCNA 2 - Module 5Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 network was recently added and will only contain end users. What command or set of commands should be entered on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new network while still allowing this new network to be advertised to other routers?Router1(config-router)# passive-interface fastethernet 0/0The 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?3Which of the following is considered a limitation of RIP v1?RIP v1 does not send subnet mask information in its updates.Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator notices that the route is still in the Router1 routing table. How much longer will Router1 keep the down network in its routing table before marking it as possibly down?155 secondsRefer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to configure the gateway of last resort?ip route 0.0.0.0 0.0.0.0 S0/0/1What are three characteristics of the RIPv1 routing protocol? (Choose three.)uses hop count as a metricconsiders a metric of 16 as infinitycalculates metrics using the Bellman Ford algorithmWhich of the following would be the correct command sequence to enable RIP on Router B for all connected networks?RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 220.17.29.0What is the default update period in seconds for the RIP routing protocol?30Refer to the exhibit. What can be concluded from the routing table output of router B? The default-information originate command has been entered on A.Refer to the exhibit. A network consists of multiple routers. What can be verified when the show ip protocols command is issued on one of the routers in the network? routing protocol configuration in use for IP on this routerRefer to the exhibit. All routers are configured with valid interface addresses in the indicated networks and are running RIPv1. The network is converged. Which routes are present in the routing tables?All routers have all /30 routes. Routers A and E also have some of the /24 routes in their routing table.Which two statements are true regarding the characteristics of RIPv1? (Choose two). It is a distance vector routing protocol.The data portion of a RIP message is encapsulated into a UDP segment.Which command or set of commands will stop the RIP routing process?RouterB(config)# no router ripRefer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator issues the show ip route command on router A. What routes would ap pear in the routing table output if the network is converged? (Choose two).R 192.168.2.0/24 [120/1]R 10.10.1.0/24 [120/2]Which command will display RIP activity as it occurs on a router?debug ip ripRefer to the output from the show ip route command. What can be concluded from the output of this router command?There are two equal cost paths to network 1.0.0.0.Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network administrator configures the command network 10.1.0.0 on Router1. What network will Router1 advertise to Router2?10.0.0.0/8Refer to the exhibit. Pings between the serial interfaces of the routers are successful. Hosts on each LAN can ping the Fa0/0 interface of the router to which they are directlyconnected through the switch. However, pings between hosts on the 10.1.1.0/24 and 10.1.2.0/24 networks are unsuccessful. What is a likely cause of this problem?RIP is configured incorrectly on R1.What will happen if an interface IP address is entered for the address portion of the network command in a RIPv1 configuration instead of a network address?All interfaces in the same classful network as the configured address will be included in the RIPv1 routing process.Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic must be forwarded to the ISP. What router or set of routers are recommended to have both a default route and the default-information originate command issued to implement this forwarding policy?only the gateway routerCCNA 2 - Module 6What two advantages does CIDR provide to a network? (Choose two.)reduced routing table sizereduced routing update trafficRefer to the exhibit. The network administrator wants to create a subnet for the po int-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?255.255.255.252Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?192.168.0.0/21Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)32-bit addresssubnet maskWhich of the following problems does VLSM help to alleviate?the shortage of IP addressesWhat does VLSM allow a network administrator to do?utilize multiple subnet masks in the same IP address spaceRefer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1 update for the network 172.16.1.0 to Router B?24Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1’s routing table. What should the administrator implement on the network?CIDRA router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?192.168.32.0 – 192.168.47.0/24A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6. Which two subnets masks adequately address the QA and Sales departments? (Choose two.)255.255.255.224 for Sales255.255.255.240 for QAIn the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?84A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit mask should be used to provide for the number of host addresses required on Router A, while wasting the fewest addresses?/27An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?192.1.1.224/28Which three interior routing protocols support VLSM? (Choose three.)OSPFRIP v2EIGRPRefer to the exhibit. The number of required host addresses for each subnet in a network is listed in the exhibit. This number includes the host address requirements for all router ports and hosts on that subnet. After all device and router port address assignments are determined, what will be the total number of unused host addresses available?29Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address ineach subnet. Which IP address would be usable for a host on one of the LANs in this network?192.168.2.130/25Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?192.168.4.15/29Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet i s given 10.0.1.192/26. What will be the result of this addressing scheme?Because RIPv2 does not support VLSM, the subnet masks will not be allowed.The subnets overlap and will be rejected by the router.Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails. The technician begins testing the network and has the following results:1. pings from R1 to the S0/0/0 interface on R2....successful2. pings from R1 to the Fa0/0 interface on R2....successful3. pings from host B to hosts on the 10.1.1.0/24 network....successful4. pings from host B to the Fa0/0 interface on R2....successful5. pings from R2 to host B....successful.The default gateway on host B is not correctly set.What is a supernet?a summarization of classful addressesCCNA 2 - Module 7Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27 network?Rip version 2 will auto summarize routes by default.Refer to the exhibit. Which two statements are true? (Choose two.)Router1 will install a route to 192.168.0.0/20Router2 will not install a route to 192.168.16.0/20Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20 network?Router2(config-router)# version 2What are two reasons to implement RIP version 2 rather than RIP version 1? (Choose two.)RIP version 2 supports VLS M.。

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。

CCNA期末考试复习题(1)

CCNA期末考试复习题一、选择题1 、图示的网络中有多少个冲突域？A 1B 2C 3D 6E 72、如图所示网络，交换机都是默认配置。

主机A需要和主机D通信，但是主机A没有默认网关的MAC地址。

哪些主机将收到主机A发出的ARP请求？A 只有主机DB 只有路由器R1C 只有主机B和CD 只有主机B，C和DE 只有主机B，C和路由器R13、如图所示，主机A属于哪个子网？A 10.197.0.0B 10.192.0.0C 10.197.184.0D 10.197.187.0E 10.197.187.1684、248表示为二进制形式是：A 11101000B 11110100C 11111000D 111110105、10BASE-T指哪种线缆？A 10Mbit/s传输速度，基带信号，线缆长度500M，同轴线B 10Mbit/s传输速度，宽带信号，线缆长度100M，同轴线C 10Mbit/s传输速度，基带信号，线缆长度100M，双绞线D 10Gbit/s传输速度，宽带信号，线缆长度500M，双绞线6、如图所示，网络管理员希望创建一个子网用于两个路由器点对点连接。

哪个子网掩码可以给点对点连接提供足够的地址，且浪费又最少？A 255.255.255.192B 255.255.255.224C 255.255.255.240D 255.255.255.248E 255.255.255.2527、如图所示，主机A希望发送一个消息给主机B。

请将下列步骤排列为正确的顺序，使得消息能够发送出去。

A——添加网络层地址B——发送比特C——创建应用层数据D——添加数据链路层地址A B—A—D—CB D—A—C—BC A—D—C—BD C—A—D—BE C—D—A—BF C—B—A—D8、一个C类网络192.168.35.0使用/28的掩码划分子网，可用子网个数及每子网的可用主机数分别是多少？A 6 子网/64主机B 14 子网/32主机C 14子网/14主机D 30子网/64主机9、哪种协议用来消灭交换环路？A TCPB RIPC STPD IGRPE IP10、因为无法ping通本地路由器，技术人员决定查看一下路由器。

CCNA期末考试题及答案试卷A(仅供参考)

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。

网络中的所有设备均使用默认配置。

此拓扑中存在多少个广播域？3579113请参见图示。

主机B 已断电。

交换机的MAC 表将发生什么变化？MAC 表不会受影响。

交换机会在Fa0/19 上删除MAC 地址。

交换机会保留MAC 地址，直到主机B 再次通电。

交换机将通过为端口Fa0/19 分配地址FFF.FFFF.FFFF 来重建MAC表。

4.请参见图示。

为了使此网络中的主机接入Internet，路由器RT_A 需要提供哪种功能？地址转换DHCP 服务ftpWeb 服务器5.哪三个地址属于私有IP 地址？（选择三项。

）10.0.0.1127.0.0.1150.0.0.1172.16.0.1192.168.0.1200.100.50.16请参见图示。

电缆1 和电缆2 分别按照特定的物理层要求接线。

表中按编号列出了每个网段以及该网段中用来连接网络组件的电缆。

哪三个网段安装的电缆是正确的？（选择三项。

）网段1网段2网段3网段4网段5网段67.OSI 模型的哪两项功能在第2 层实现？（选择两项）物理编址编码路由布线介质访问控制8.请参见图示。

网络管理员想通过Modem1 从PC1 远程访问路由器的CLI。

要实现此访问，应将路由器的哪一个端口连接到Modem2？控制台端口以太网端口辅助端口串行端口9请参见图示。

某学生对5e 类电缆两端的接线方法如图所示。

结果是什么？（选择两项）电缆无法使用，必须重新接线。

该电缆适合作为全反电缆使用。

该电缆适合作为快速以太网交叉电缆使用。

该电缆适合作为千兆以太网直通电缆使用。

该电缆适合在支持Auto-MDIX 的两台100 Mbps 交换机之间使用。

思科网络学院CCNA第二学期ERouter期末考试题2.docx

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。
Optio n1and Opti on 2 are correct.
14
网络管理员使用RIP路由协议在一个自治系统内实施路由。
2points for Option 1
19
请参见图示。所有路由器接口都配置了
IP地址且工作正常。如果没有配置任何路由协议或静态路由，那么路由器route命令输出中将包含什么信息？
所有192.168x0网络都将包含在路由表中。
到网络192.168.1.0/24、192.168.2.0/24和192.168.3.0/24的路由将包含在路由表中。
（选择两项。）
使用贝尔曼-福特算法确定最佳路径。
显示确切的网络拓扑图。
可以使大型网络快速收敛。
定期将完整的路由表发送给所有连接的设备。
在复杂网络和分层设计网络中很有用。
Optio n1and Opti on 4 are correct.
15
请参见图示。
这几台路由器已正确配置为使用动态路由协议（使用默认设置），并且网络已完全收敛。路
时，会发生怎样的转发行为？
数据包将被丢弃。
数据包将转发到“最后选用网关”。
数据包将与192.168.0.0网络匹配，并从Serial0/0转发出去。
数据包将与192.168.0.8子网形成最精确匹配，并从Serial0/1转发出去。
2poi nts for Optio n 1
so/u/u
R1#
＜省略部分输出〉
3192.16S.1.0/24 [1/0] via 172.16-2.2

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.。

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。

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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C C N A第二学期期末考试E a mThe latest revision on November 22, 2020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。

R2 S0/0/1 接口的 IP 地址为。

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，路由器收到另一同一目的网络的路由条目的更新，且与前者比，该路由跳数较少。

对于此更新，路由器会采取什么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 c 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。

会使用哪条路传输数据数据会通过 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 rip B(config-router)# B(config-router)#A(config)# router rip A(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.。

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。

此问题可能的是什么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 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。

area 0哪个路由器接口将参与 OSPFF 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 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 LA 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ping 通在 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1346请参见图示。

所有路由均已通告给所有路由器且均运行常。

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。

）/8请参见图示。

A 无法访问 Internet，经查明这是由编址问题造成的。

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