CISCOCCNA网络工程师题库.docx

1、CISCOCCNA网络工程师题库培训大讲堂官方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鸿鹄论坛招募CCNA、CCNP答疑讲师答疑地点：鸿鹄官方YY频道3660V104系列是官方的终结版本，以后不会再出V105 V106 V108等等=更新内容：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 sw

2、itch, 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. #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 confi

3、gurationB. show environmentC. show inventoryD. show platformE. show versionAnswer: ESection: Chapter 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

4、configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the (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？)B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.C. A native VLAN mismatch error

5、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 address in the （/29 子网

6、的路由器上配置的串行端口？）Answer: FSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:QUESTION 5valid IP address of this host()Answer: CSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：考查VLSMA：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 assignedAnswer: BDSecti

7、on: Chapter 3: IP Addressing and VLSMExplanation/Reference: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 I

8、P 堆栈的状态。您要执行此任务将 ping 哪个地址？Answer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：使用ping来检测主机的IP栈。QUESTION 8 ping between the hosts are unsuccessful. What two things can be done to allow communications between the hosts (Choose two.)A. Replace the straight-through cable with a c

9、rossover cable.B. Change the subnet mask of the hosts to /25.C. Change the subnet mask of the hosts to /26.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。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 9 un

10、able to ping any remote devices. What is preventing the router from pinging remote devices()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. The IP address is an inval

11、id class D multicast address.Answer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：考查VLSM。A：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哪个命令用于从RAM复制到NVRAM的配置A. copy running-config

12、 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 load a configuration from a TFTP server and

13、 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/Reference:QUESTION 12A system administrator types th

14、e command to change the hostname of a router. Where on the Cisco IFS is that change storedA. 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 13Which command is used to configure a defau

15、lt routeAnswer: 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认网关？）(Choose two.)Answer: CESection: Chapter 6: IP RoutingExplanation/Reference:产生默认网关的两种方式ip d

16、efault-networkip routeQUESTION 15Which command would you configure globally on a Cisco router that would allow you to 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 IOSExplanati

17、on/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 17W

18、hich 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 packetAnswer: 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

19、. show processC. show systemD. show versionAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:查看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: C

20、hapter 14: Wide Area Network (WAN)Explanation/Reference:缺省封装是HDLCQUESTION 20What must be set correctly when configuring 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

21、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 video 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

22、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. modulationD. 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。QUE

23、STION 22Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communicationOSI 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: ES

24、ection: 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 between 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 troub

25、leshooting 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. sessionC. 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 referenc

26、e 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. 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

27、 to powercycle a routerA. show reloadB. show bootC. show running-configD. show versionAnswer: DSection: Chapter 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. A

28、TMAnswer: 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：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 usedA. ATMB. HDLCC. Frame RelayD. PPPAnswer: CSection: Chapter 14: Wide Area Network (

29、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/DSU 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 ana

30、log signals from a router to a phone line; a modem converts digital signals from a router to a leased 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: Wide 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 switc