CISCO CCNA网络工程师题库.doc

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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
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QUESTION 1
When 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. #
Answer: E
Section: Chapter 4: Introduction to Cisco IOS
Explanation/Reference:
特权模式就是#提示符
QUESTION 2
Which 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 configuration
B. show environment
C. show inventory
D. show platform
E. show version
Answer: E
Section: Chapter 4: Introduction to Cisco IOS
Explanation/Reference:
查看系统的软件和硬件信息使用的命令是show version
QUESTION 3
Cisco 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 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 VLAN mismatch error message will appear.
D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.
Answer: C
Section: Chapter 10: VLAN
Explanation/Reference:
如果两边native不匹配的话.switch将报native不匹配的日志信息
QUESTION 4
Which command would correctly configure a serial port on a router with the last usable host address in the 192.216.32.32/29 subnet?
（哪个命令正确地将最后的可用主机地址，192.216.32.32/29 子网的路由器上配置的串行端口？）
A. Router(config-if)# ip address 192.216.32.38 255.255.255.240
B. Router(config-if)# ip address 192.216.32.39 255.255.255.224
C. Router(config-if)# ip address 192.216.32.63 255.255.255.248
D. Router(config-if)# ip address 192.216.32.39 255.255.255.248
E. Router(config-if)# ip address 192.216.32.63 255.255.255.248
F. Router(config-if)# ip address 192.216.32.38 255.255.255.248
Answer: F
Section: Chapter 4: Introduction to Cisco IOS
Explanation/Reference:
192.216.32.32/29它的块大小为8掩码为255.255.255.248地址范围为192.216.32.32-39
QUESTION 5
The network default gateway applying to a host by DHCP is 192.168.5.33/28. 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 192.168.5.33\/28。哪个选项是有效的主机IP 地址？)
A. 192.168.5.55
B. 192.168.5.47
C. 192.168.5.40
D. 192.168.5.32
E. 192.168.5.14
Answer: C
Section: Chapter 3: IP Addressing and VLSM
Explanation/Reference:
考点：考查VLSM
192.168.5.33/28所在网段的范围是192.168.5.32--192.168.5.47/28
A：超出范围
B：广播地址
C：正确
D：网络号
E：超出范围
QUESTION 6
Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0? (Choose two.){哪两个地址可以分配给与子网掩码 255.255.254.0 的主机？}
A. 113.10.4.0
B. 186.54.3.0
C. 175.33.3.255
D. 26.35.2.255
E. 17.35.36.0
Answer: BD
Section: Chapter 3: IP Addressing and VLSM
Explanation/Reference:
考点：考查VLSM
A：网络号
B/D：正确
C：广播地址
E：网络号
QUESTION 7
The network administrator has asked you to check the status of the workstation's 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. 10.1.1.1
B. 127.0.0.1
C. 192.168.0.1
D. 239.1.1.1
Answer: B
Section: Chapter 3: IP Addressing and VLSM
Explanation/Reference:
考点：使用ping来检测主机的IP栈。
ping 127.0.0.1实现。
QUESTION 8
Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IP address of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts to ping between 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 192.0.2.24\/28。B 工作站已分配 IP 地址为 192.0.2.100\/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 the hosts to /25.
C. Change the subnet mask of the hosts to /26.
D. Change the address of Workstation A to 192.0.2.15.
E. Change the address of Workstation B to 192.0.2.111.
Answer: AB
Section: Chapter 3: IP Addressing and VLSM
Explanation/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
Your ISP has given you the address 223.5.14.6/29 to assign to your router's interface. They have also given you the default gateway address of 223.5.14.7. After you have configured the address, the router is unable to ping any remote devices. What is preventing the router from pinging remote devices?(您的 ISP 给你要分配给您的路由器接口地址 223.5.14.6\/29。他们还授予您是 223.5.14.7 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. The IP address is an invalid class D multicast address.
Answer: B
Section: Chapter 3: IP Addressing and VLSM
Explanation/Reference:
考点：考查VLSM。
223.5.14.6/29所在网段的范围是：223.5.14.0--223.5.14.7/29
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 10
Which 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 startup-config
B. copy startup-config: running-config:
C. copy running config startup config
D. copy startup config running config
E. write terminal
Answer: A
Section: Chapter 4: Introduction to Cisco IOS
Explanation/Reference:
QUESTION 11
Which command is used to 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-config
C. copy TFTP: startup-config
D. copy startup-config: TFTP:
Answer: B
Section: Chapter 4: Introduction to Cisco IOS
Explanation/Reference:
QUESTION 12
A system administrator types the command to change the hostname of a router. Where on the Cisco IFS is that change stored?
A. NVRAM
B. RAM
C. FLASH
D. ROM
E. PCMCIA
Answer: B
Section: Chapter 4: Introduction to Cisco IOS
Explanation/Reference:
running-config保存在RAM中
startup-config保存在NVRAM中
QUESTION 13
Which command is used to configure a default route?
A. ip route 172.16.1.0 255.255.255.0 0.0.0.0
B. ip route 172.16.1.0 255.255.255.0 172.16.2.1
C. ip route 0.0.0.0 255.255.255.0 172.16.2.1
D. ip route 0.0.0.0 0.0.0.0 172.16.2.1
Answer: D
Section: Chapter 6: IP Routing
Explanation/Reference:
QUESTION 14
If 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.)
A. ip default-gateway 0.0.0.0
B. ip route 172.16.2.1 0.0.0.0 0.0.0.0
C. ip default-network 0.0.0.0
D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1
E. ip route 0.0.0.0 0.0.0.0 172.16.2.1
Answer: CE
Section: Chapter 6: IP Routing
Explanation/Reference:
产生默认网关的两种方式
ip default-network
ip route
QUESTION 15
Which 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 cdp
B. cdp enable
C. cdp run
D. run cdp
Answer: C
Section: Chapter 5: Managing Cisco IOS
Explanation/Reference:
QUESTION 16
Which 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 route
B. show route
C. traceroute
D. trace ip route
Answer: C
Section: Chapter 2: TCP/IP
Explanation/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 17
Which command is used to debug a ping command?
{哪些命令用于调试 ping 命令？}
A. debug icmp
B. debug ip icmp
C. debug tcp
D. debug packet
Answer: B
Section: Chapter 5: Managing Cisco IOS
Explanation/Reference:
ping调用了icmp协议，而icmp数据包封装在ip包中。
QUESTION 18
Which command displays CPU utilization?
{哪个命令显示的 CPU 利用率呢？}
A. show protocols
B. show process
C. show system
D. show version
Answer: B
Section: Chapter 5: Managing Cisco IOS
Explanation/Reference:
查看CPU利用率。
QUESTION 19
When 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-dxi
B. frame-relay
C. hdlc
D. lapb
E. ppp
Answer: C
Section: Chapter 14: Wide Area Network (WAN)
Explanation/Reference:
缺省封装是HDLC
QUESTION 20
What 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. bandwidth
B. delay
C. load
D. reliability
Answer: A
Section: Chapter 6: IP Routing
Explanation/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 21
A 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. modulation
D. packet switching exchange (PSE)
E. reliable transport protocol (RTP)
Answer: B
Section: Chapter 9: Switching
Explanation/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 22
Which 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 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. transport
B. network
C. presentation
D. session
E. application
Answer: E
Section: Chapter 1: Introduction
Explanation/Reference:
哪一层确定的接收程序的可用性？
应用层提供
QUESTION 23
Data 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 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. presentation
B. session
C. transport
D. network
E. physical
Answer: D
Section: Chapter 1: Introduction
Explanation/Reference:
解决网络问题，先确保网络层通信。
QUESTION 24
Which 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. LAN
B. routing
C. WAN
D. network
Answer: B
Section: Chapter 1: Introduction
Explanation/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 25
Which command reveals the last method used to powercycle a router?
A. show reload
B. show boot
C. show running-config
D. show version
Answer: D
Section: Chapter 5: Managing Cisco IOS
Explanation/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 26
Which three options are valid WAN connectivity methods? (Choose three.)
A. PPP
B. WAP
C. HDLC
D. MPLS
E. L2TPv3
F. ATM
Answer: ACF
Section: 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 27
Refer to the exhibit. Which WAN protocol is being used?

A. ATM
B. HDLC
C. Frame Relay
D. PPP
Answer: C
Section: 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 28
What 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 analog 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: D
Section: 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 29
A 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. Visually 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 sticky 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: C
Section: Chapter 9: Switching
Explanation/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 30
When 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. 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: A
Section: 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 31
What 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 traffic exceeding the CIR is marked discard eligible.
Answer: D
Section: 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 32
What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)
A. Th