CISCOCCNA网络工程师题库

1、培训大讲堂官方YY 频道：3660mCCNA题库考试代号： 640-802考试时间：英文110+30=140分钟通过分数： 825题库版本： V104.4鸿鹄论坛招募CCNA、CCNP答疑讲师答疑地点：鸿鹄官方YY频道3660鸿鹄大讲堂：/thread-46172-1-1.htmlCCNA题库战报交流QQ群：144288127 （500人超级群）CCNA题库战报交流区： /forum-261-1.html1000 G视频教程免费下载：/forum-228-1.htmlCCNA（640-802）题库V104.4CCNA（640-802）题库V104.4（情人节版）CCNA 题库战报500人超级Q

2、Q群 144288127V104系列是官方的终结版本，以后不会再出V105 V106 V108等等CCNA 最新题库/最新战报 发布区： /forum-261-1.html下载官方正版题库、看最新考试战报，请随时关注 鸿鹄论坛 CCNA考试报名1900，详情请联系鸿鹄全国区十七名客服 QQ 712023090-712023106=更新内容：V104.1修正V104中错误题目，确定经典争议题目答案；V104.2增加拖图题并可完美模拟考试，VCE题库增加中文注释；V104.3针对思科CCNA考试变题，更新考试新增题目93Q,更新V104.2实验题；V104.4增加全文中文注释，汇总V104.3九次

3、更新，删除部分旧题目，为目前最新官方正版题库；2011.8.1 增加每日新题，修订部分错误。2012.2.14 情人节版增加5道新题，分别是519、520、521、522、523题修改176题、375题、443题、482题答案错误修改59题、88题、453题、107题、270题注释错误增加个别疑难拖图题注释，优化实验题=QUESTION 1When you are logged into a switch, which prompt indicates that you are in privileged mode?(当您登录到交换机，哪种提示表明你在特权模式？)A. %B. C. D. $E

4、. #Answer: ESection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:特权模式就是#提示符QUESTION 2Which command shows system hardware and software version information?(哪些命令显示系统硬件和软件的版本信息？)A. show configurationB. show environmentC. show inventoryD. show platformE. show versionAnswer: ESection: Chapt

5、er 4: Introduction to Cisco IOSExplanation/Reference:查看系统的软件和硬件信息使用的命令是show versionQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native

6、VLAN is not specified.What will happen in this scenario?(思科 Catalyst 交换机 CAT1 和 CAT2 有它们之间的连接使用端口 FA0/13。两个交换机之间用802.1Q中继配置，CAT1做为VLAN10的主机，但在 CAT2 上的本地 VLAN 未指定。在这种情况下会发生什么？)A. 802.1Q giants frames could saturate the link.B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.C. A native V

7、LAN mismatch error message will appear.D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.Answer: CSection: Chapter 10: VLANExplanation/Reference:如果两边native不匹配的话.switch将报native不匹配的日志信息QUESTION 4Which command would correctly configure a serial port on a router with the last usable host add

8、ress in the 2/29 subnet?（哪个命令正确地将最后的可用主机地址，2/29 子网的路由器上配置的串行端口？）A. Router(config-if)# ip address 8 40B. Router(config-if)# ip address 9 24C. Router(config-if)# ip address 3 48D. Router(config-if)# ip address 9 48E. Router(config-if)# ip address 3 48F. Router(config-if)# ip address 8 48Answer: FSecti

9、on: Chapter 4: Introduction to Cisco IOSExplanation/Reference:2/29它的块大小为8掩码为48地址范围为2-39QUESTION 5The network default gateway applying to a host by DHCP is 3/28. Which option is the valid IP address of this host?(应用到由 DHCP 主机的网络默认网关是 3/28。哪个选项是有效的主机IP 地址？)A. 5B. 7C. 0D. 2E. 4Answer: CSection: Chapter

10、 3: IP Addressing and VLSMExplanation/Reference:考点：考查VLSM3/28所在网段的范围是2-7/28A：超出范围B：广播地址C：正确D：网络号E：超出范围QUESTION 6Which two addresses can be assigned to a host with a subnet mask of ? (Choose two.)哪两个地址可以分配给与子网掩码 的主机？A. B. C. 55D. 55E. Answer: BDSection: Chapter 3: IP Addressing and VLSMExplanation/Re

11、ference:考点：考查VLSMA：网络号B/D：正确C：广播地址E：网络号QUESTION 7The network administrator has asked you to check the status of the workstations IP stack by pinging the loopback address. Which address would you ping to perform this task?网络管理员已要求您通过 ping 环回地址检查工作站的 IP 堆栈的状态。您要执行此任务将 ping 哪个地址？A. B. C. D. Answer: BSe

12、ction: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：使用ping来检测主机的IP栈。ping 实现。QUESTION 8Workstation A has been assigned an IP address of 4/28. Workstation B has been assigned an IP address of 00/28. The two workstations are connected with a straight-through cable. Attempts to ping between

13、 the hosts are unsuccessful. What two things can be done to allow communications between the hosts? (Choose two.)A 工作站已分配 IP 地址为 4/28。B 工作站已分配 IP 地址为 00/28。两台工作站与直通电缆连接。在主机之间 ping 不成功。允许在主机之间的通信，可以做两件事情？（选择两个）。A. Replace the straight-through cable with a crossover cable.B. Change the subnet mask of

14、the hosts to /25.C. Change the subnet mask of the hosts to /26.D. Change the address of Workstation A to 5.E. Change the address of Workstation B to 11.Answer: ABSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：同构设备使用交叉线，两端的IP需要在同一个子网。A：使用交叉线替换现有的直通线。正确。B：修改掩码为25位，正确。C：修改掩码为26为，错误。

15、不能使他们在同一个子网。D/E：错误，都不能使他们在同一个子网。QUESTION 9Your ISP has given you the address /29 to assign to your routers interface. They have also given you the default gateway address of . After you have configured the address, the router is unable to ping any remote devices. What is preventing the router from p

16、inging remote devices?(您的 ISP 给你要分配给您的路由器接口地址 /29。他们还授予您是 的默认网关地址。您已配置了地址后，路由器是无法 ping 任何远程设备。什么在阻碍 pinging 远程设备的路由器？)A. The default gateway is not an address on this subnet.B. The default gateway is the broadcast address for this subnet.C. The IP address is the broadcast address for this subnet.D.

17、The IP address is an invalid class D multicast address.Answer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：考查VLSM。/29所在网段的范围是：-/29A：默认网关不属于这个子网，错误B：默认网关是这个子网的广播地址，正确C：这个地址是子网的广播地址，错误D：这个地址是组播地址，错误。QUESTION 10Which command is used to copy the configuration from RAM into NVRAM?

18、哪个命令用于从RAM复制到NVRAM的配置A. copy running-config startup-configB. copy startup-config: running-config:C. copy running config startup configD. copy startup config running configE. write terminalAnswer: ASection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:QUESTION 11Which command is used to

19、load a configuration from a TFTP server and merge the configuration into RAM?(哪些命令用于从 TFTP 服务器加载配置或合并到 RAM 的配置？)A. copy running-config: TFTP:B. copy TFTP: running-configC. copy TFTP: startup-configD. copy startup-config: TFTP:Answer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Referenc

20、e:QUESTION 12A system administrator types the command to change the hostname of a router. Where on the Cisco IFS is that change stored?A. NVRAMB. RAMC. FLASHD. ROME. PCMCIAAnswer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:running-config保存在RAM中startup-config保存在NVRAM中QUESTION

21、 13Which command is used to configure a default route?A. ip route B. ip route C. ip route D. ip route Answer: DSection: Chapter 6: IP RoutingExplanation/Reference:QUESTION 14If IP routing is enabled, which two commands set the gateway of last resort to the default gateway?（如果启用了 IP 路由，哪两个命令设置网关的最后到默

22、认网关？）(Choose two.)A. ip default-gateway B. ip route C. ip default-network D. ip default-route E. ip route Answer: CESection: Chapter 6: IP RoutingExplanation/Reference:产生默认网关的两种方式ip default-networkip routeQUESTION 15Which command would you configure globally on a Cisco router that would allow you to

23、 view directly connected Cisco devices?(该命令将全局上配置使您可以直接查看的 Cisco 路由器连接 Cisco 设备吗？)A. enable cdpB. cdp enableC. cdp runD. run cdpAnswer: CSection: Chapter 5: Managing Cisco IOSExplanation/Reference:QUESTION 16Which command is used to see the path taken by packets across an IP network?(哪些命令用于看到通过 IP 网

24、络数据包所采取的路径？)A. show ip routeB. show routeC. tracerouteD. trace ip routeAnswer: CSection: Chapter 2: TCP/IPExplanation/Reference:哪条命令用于查看数据包转发所经过的路径A:查看路由表B：没有这条命令C：正确D：没这条命令QUESTION 17Which command is used to debug a ping command?哪些命令用于调试 ping 命令？A. debug icmpB. debug ip icmpC. debug tcpD. debug pac

25、ketAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:ping调用了icmp协议，而icmp数据包封装在ip包中。QUESTION 18Which command displays CPU utilization?哪个命令显示的 CPU 利用率呢？A. show protocolsB. show processC. show systemD. show versionAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:查

26、看CPU利用率。QUESTION 19When configuring a serial interface on a router, what is the default encapsulation?在配置一个串行接口的路由器，什么是默认的封装？A. atm-dxiB. frame-relayC. hdlcD. lapbE. pppAnswer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:缺省封装是HDLCQUESTION 20What must be set correctly when conf

27、iguring a serial interface so that higher-level protocols calculate the best route?什么时，必须设置正确配置串行接口，以便更高级别的协议计算最佳路线？A. bandwidthB. delayC. loadD. reliabilityAnswer: ASection: Chapter 6: IP RoutingExplanation/Reference:为了使高层路由协议计算最佳路由，串口的什么东西必须被设置正确？在接口下，只有带宽是可以配置的。QUESTION 21A company implements vid

28、eo conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?公司对他们的以太网 LAN ip 实现视频会议。用户注意网络变慢，和视频断断续续或完全失败。最有可能的原因是什么？A. minimum cell rate (MCR)B. quality of service (QoS)C. mod

29、ulationD. packet switching exchange (PSE)E. reliable transport protocol (RTP)Answer: BSection: Chapter 9: SwitchingExplanation/Reference:考点：当网络中使用视频会议后发现网络非常慢，什么原因引起的？QoS：用于定制策略对不同流量进行控制。QUESTION 22Which layer in the OSI reference model is responsible for determining the availability of the receivin

30、g program and checking to see if enough resources exist for that communication?OSI 参考模型在哪一层负责确定接收程序的可用性和检查足够的资源，是否存在该通信？A. transportB. networkC. presentationD. sessionE. applicationAnswer: ESection: Chapter 1: IntroductionExplanation/Reference:哪一层确定的接收程序的可用性？应用层提供QUESTION 23Data transfer is slow bet

31、ween the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin?数据传输速度慢的源和目标之间。不保持在 OSI 参考模型的传输层所要求的服务质量。要解决此问题，在哪一层应故障排除过程开始？A. presentationB. sess

32、ionC. transportD. networkE. physicalAnswer: DSection: Chapter 1: IntroductionExplanation/Reference:解决网络问题，先确保网络层通信。QUESTION 24Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching?哪些协议在网络层 OSI 参考模型中找到，负责路径测定和交通切换？A.

33、 LANB. routingC. WAND. networkAnswer: BSection: Chapter 1: IntroductionExplanation/Reference:OSI网络层中什么提供了路径选择和流量转发？由路由协议提供。通过手工或者动态学习路由条目实现。QUESTION 25Which command reveals the last method used to powercycle a router?A. show reloadB. show bootC. show running-configD. show versionAnswer: DSection: Ch

34、apter 5: Managing Cisco IOSExplanation/Reference:哪一个命令可以显示最近一次被用来重启路由器的方法？QUESTION 26Which three options are valid WAN connectivity methods? (Choose three.)A. PPPB. WAPC. HDLCD. MPLSE. L2TPv3F. ATMAnswer: ACFSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:哪三种封装属于WAN链路的?A:点到点协议，正确B：

35、无线加密技术，错误C:思科缺省封装格式，正确。D：多协议标签转换，错误E：隧道协议，错误F：正确。QUESTION 27Refer to the exhibit. Which WAN protocol is being used?A. ATMB. HDLCC. Frame RelayD. PPPAnswer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:由图中的红线可看到发送接受LMI信息。属于FR的数据包。QUESTION 28What is the difference between a CSU/D

36、SU and a modem?【一个CSU/DSU和调制解调器之间的区别是什么？】A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased

37、line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.Answer: DSection: Chapter 14: W

38、ide Area Network (WAN)Explanation/Reference:CSU/DSU一般是专线，MODEN是将模拟信号与数字信号转换QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?A. Vi

39、sually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command.B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command.C. Use the switchport port-security MAC address stick

40、y command on all the switch ports that have end devices connected to them.有端设备连接到他们的所有交换机端口上使用交换机端口端口安全 MAC 地址粘滞命令。D. Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.Answer: CSection: Ch

41、apter 9: SwitchingExplanation/Reference:考点：有200台主机需要接入，采用什么方式来增强网络安全性？A：先验证mac安全性，然后在交换机上绑定。错误，工作量太大B：用户发送邮件认证再在交换机上配置，错误，不科学。C：使用port-security，正确。D：错误，工作量太大。QUESTION 30When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?【帧中继连接故障排除时，执行环回测试时的第一步是什么？】A

42、. Set the encapsulation of the interface to HDLC.B. Place the CSU/DSU in local-loop mode.C. Enable local-loop mode on the DCE Frame Relay router.D. Verify that the encapsulation is set to Frame Relay.Answer: ASection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:在对FR进行排错的时候，当做回环测试的时候，第一步

43、如何处理？A：讲接口配置成HDLC，正确，FR封装下无法正常ping自己端口QUESTION 31What occurs on a Frame Relay network when the CIR is exceeded?A. All TCP traffic is marked discard eligible.B. All UDP traffic is marked discard eligible and a BECN is sent.C. All TCP traffic is marked discard eligible and a BECN is sent.D. All traffi

44、c exceeding the CIR is marked discard eligible.Answer: DSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:在FR网络中，当CIR超过时会发生什么情况？D：所有超过的流量都丢弃。QUESTION 32What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)A. They create split-horizon issues.B. They r

45、equire a unique subnet within a routing domain.C. They emulate leased lines.D. They are ideal for full-mesh topologies.E. They require the use of NBMA options when using OSPF.Answer: BCSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:帧中继点到点子接口的特点？A：水平分割，错误。B：每个子接口需要一个独立的网段，正确。C：类似专线

46、，正确。D:全网互联是理想拓扑，错误。通常是hub-spokeE：NBMA不支持OSPF，错误。QUESTION 33Refer to the exhibit. Addresses within the range /24 are not being translated to the 1.128.0/16 range. Which command shows if /24 are allowed inside addresses?A. debug ip natB. show access-listC. show ip nat translationD. show ip nat statist

47、icsAnswer: BSection: Chapter 8: NATExplanation/Reference:那条命令可以看到/24是否在允许转换范围。允许的范围是通过ACL定义的。A：打开NAT转换的debug信息，错误B：查看acl信息，正确。C：查看NAT转换表，错误。D：查看静态NAT。错误QUESTION 34A wireless client cannot connect to an 802.11b/g BSS with a b/g wireless card. The client section of the access point does not list any a

48、ctive WLAN clients. What is a possible reason for this?一台带有b/g无线网上的无线客户机不能连接到一个8020.11b/g 的基站。客户端部分没有发现可用的无线局域网。这种情况是什么原因？A. The incorrect channel is configured on the client.B. The clients IP address is on the wrong subnet.C. The client has an incorrect pre-shared key.D. The SSID is configured inco

49、rrectly on the client.Answer: DSection: Chapter 11: WirelessExplanation/Reference:客户端无法连接到无限接入点，查看不到可用的无线信号。这通常是SSID信号没有配置正确。A：不正确的信道。错误B：客户端的IP地址配置错误C：客户端的共享key错误。D：SSID配置不正确。QUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.)哪两个功能 WPAv1 没有添加地址

50、找到 wep 的固有弱点？（选择两个A. a stronger encryption algorithmB. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vectorE. per frame sequence countersAnswer: BESection: Chapter 11: WirelessExplanation/Reference:考点：WPA1中增强哪两个在WEP中发现的弱点？WEP存在的隐患主要是依赖共享密钥A：更强的加密算法B：混合使用的密钥C：共

51、享密钥认证D：较短的初始化向量E：一个帧一个序列计数器。QUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.)A. WEPB. CCKMC. AESD. TKIPE. CCMPAnswer: ADSection: Chapter 11: WirelessExplanation/Reference:考点：哪两种无限加密技术依赖RC4A:有线等效保密协议B：英特尔开发一种协议C：高级加密标准D：暂时密钥集成协议E:基于AES的加密方式QUEST

52、ION 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: BDSection: Chapter 6: IP RoutingExplanation/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

53、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: CESection: Chapter 1: IntroductionExplanation/Reference: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

54、：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

55、. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.Answer: ADSection: Chapter 6: IP RoutingExplanation/Reference: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QUESTION 4

56、0Refer to the exhibit. According to the routing table, where will the router send a packet destined for5?A. B. C. D. Answer: CSection: Chapter 6: IP RoutingExplanation/Reference:路由查找原则：最长掩码匹配原则。QUESTION 41Which command shows if an access list is assigned to an interface?A. show ip interface interfac

57、e access-listsB. show ip access-lists interface interfaceC. show ip interface interfaceD. show ip access-lists interfaceAnswer: CSection: Chapter 7: SecurityExplanation/Reference:QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?A. The address

58、is removed from the pool until 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 re

59、solved.Answer: ASection: Chapter 5: Managing Cisco IOSExplanation/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 43Refer to the exhibit. You are connected to the router as user Mike. Which command allows you to seeo

60、utput from the OSPF debug command?A. terminal monitorB. show debuggingC. show sessionsD. show ip ospf interfaceAnswer: ASection: Chapter 6: IP RoutingExplanation/Reference:A：让debug信息在终端上显示出来B：没这条命令C：查看会话信息。D:查看启用了ospf的接口的相关信息。QUESTION 44Refer to the exhibit. If number 2 is selected from the setup sc