ccna考试题库

1、QUESTION 37What are two characteristics of RIPv2? (Choose two.)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute pathAnswer: BDExplanation/Reference:A：有类路由协议，错误B：可变长度子网掩码，正确C：采用广播地址更新，错误D：手动路由汇总，正确E:使用spf算法计算路径，错误。QUESTION 38Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A. 1000BASE-CXB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXAnswer: CEExplanation/Referenc

2、e:A：最长距离25米B：最长距离100米C：最长距离3000米D：最长距离550米E：最长距离70千米QUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.Answer: ADExplanation/Referen

3、ce:考点：考查距离矢量路由协议特性A：周期性更新，正确B：发送整个路由表到整个路由域，错误，只发送给邻居C：使用SPF算法，错误D：依靠邻居发送更新来更新路由表，正确E：在数据库中维护整个网络的拓扑。错误Which command shows if an access list is assigned to an interface?A. show ip interface interface access-listsB. show ip access-lists interface interfaceC. show ip interface interfaceD. show ip access-lists interfaceAnswer: CExplanation/Reference:QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?A. The address is removed from the pool until

4、 the conflict is resolved.B. The address remains in the pool until the conflict is resolved.C. Only the IP detected by Gratuitous ARP is removed from the pool.D. Only the IP detected by Ping is removed from the pool.E. The IP will be shown, even after the conflict is resolved.Answer: AExplanation/Reference:show ip dhcp conflict命令可以查看哪些ip地址在使用上有冲突。有冲突的地址不再分配出去。A：地址被删除直到冲突解决，正确B:地址保留直到冲突解决，错误C/D：答案片面。E：当冲突解决后，地址会被显示。错误。QUESTION 44Refer to the exhibit. If number 2 is selected from the setup script,

5、 what happens when the user runs setupfrom a privileged prompt?A. Setup is additive and any changes will be added to the config script.B. Setup effectively starts the configuration over as if the router was booted for the first time.C. Setup will not run if an enable secret password exists on the router.D. Setup will not run, because it is only viable when no configuration exists on the router.Answer: AExplanation/Reference:0不保存进入IOS命令配置模式1不保存返回设置模式2保存退出A：设置和改动被保存到配置脚本B：为有效地重新开始配置，如果路由器是第一次启动的配置

6、。C：如果配置了密码，设置不会运行D：设置不可用，因为它只能在没有配置存在时才有效QUESTION 49Which two statements describe the Cisco implementation of VLANs? (Choose two.)A. VLAN 1 is the default Ethernet VLAN.B. CDP advertisements are only sent on VLAN 1002.C. By default, the management VLAN is VLAN 1005.D. By default, the switch IP address is in VLAN 1005.E. VLAN 1002 through 1005 are automatically created and cannot be deleted.Answer: AEExplanation/Reference:考点：考查vlan知识点。A：缺省都存在vlan1，端口都属于vlan1，正确B：CDP信息只发送到vlan1002，错误，vlan1002是fddi

7、网络的vlan号。C：缺省情况交换机IP配置在vlan1005，错误，vlan1005trnet网络的vlan号。缺省在vlan1里面。D：vlan1002-1005自动生成并不能被删除，正确，他们都是被保留的特殊vlan。QUESTION 56 没有理解什么意思Refer to the exhibit. What does the (*) represent in the output?A. Packet is destined for a local interface to the router.B. Packet was translated, but no response was received from the distant device.C. Packet was not translated, because no additional ports are available.D. Packet was translated and fast switched to the destination.Answer: DExplanation/Reference:由图

8、中提示信息可以看出，源为10.10.0.2已经有个一个转换，所以后续的数据包快速转发。What are three advantages of VLANs? (Choose three.)A. VLANs establish broadcast domains in switched networks.B. VLANs utilize packet filtering to enhance network security.C. VLANs provide a method of conserving IP addresses in large networks.D. VLANs provide a low-latency internetworking alternative to routed networks.E. VLANs allow access to network services based on department, not physical location.F. VLANs can greatly simplify adding, moving, or cha

9、nging hosts on the network.Answer: AEFExplanation/Reference:A：VLAN在交换网络中建立广播域，正确B：利用VLAN的数据包过滤，增强网络的安全性。错误，没有这个特性。C：提供了在大型网络中的保护IP地址的方法。错误D：提供低延迟互联网络替代路由网络。错误E：vlan允许基于逻辑划分的网络访问，不是物理位置。正确。F：VLAN可以大大简化添加，移动或更改网络上的主机。正确。QUESTION 61An administrator would like to configure a switch over a virtual terminal connection from locations outsideof the local LAN. Which of the following are required in order for the switch to be configured from a remotelocation? (Choose two.)A. The switch must be configured with an IP address, subnet mask, and default gateway.B. The switch must be connected to a router over a VLAN trunk.C. The switch must be reachable through a port connected to its management VLAN.D. The switch console port must

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