CCNA640-802 V13题库试题分析17(艾迪飞吴老师讲解)

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CCNA640-802 V13题库试题分析16(艾迪飞吴老师讲解)
1．  Refer to the exhibit. Hosts in network 192.168.2.0 are unable to reach hosts in network 192.168.3.0. Based on the output from RouterA, what are two possible reasons for the failure? (Choose two.)

  

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A. The cable that is connected to S0/0 on RouterA is faulty.

B. Interface S0/0 on RouterB is administratively down.

C. Interface S0/0 on RouterA is configured with an incorrect subnet mask.

D. The IP address that is configured on S0/0 of RouterB is not in the correct subnet.

E. Interface S0/0 on RouterA is not receiving a clock signal from the CSU/DSU.

F. The encapsulation that is configured on S0/0 of RouterB does not match the encapsulation that is configured on S0/0 of RouterA.

Answer: EF

解释一下：串行接口的状态为一个up一个down，出现的可能的情况有：没有收到keeplive的报文，或是接口的时钟频率没有设置，或是接口封装不匹配，这些都有可能导致接口的链路层为down的。





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2. When upgrading the IOS image, the network administrator receives the exhibited error message. What could be the cause of this error?

  

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A.      The new IOS image is too large for the router flash memory.

B.      The TFTP server is unreachable from the router.

C.      The new IOS image is not correct for this router platform.

D. The IOS image on the TFTP server is corrupt.

E. There is not enough disk space on the TFTP server for the IOS image.

Answer: B

解释一下：下面的错误显示为error opening tftp……（timed out）表示连接tftp服务器失败。

所以这个灌装IOS失败的原因是路由器无法连接到tftp服务器上。





3. The Frame Relay network in the diagram is not functioning properly. What is the cause of the problem?

  

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A. The Gallant router has the wrong LMI type configured.

B. Inverse ARP is providing the wrong PVC information to the Gallant router.

C. The S3 interface of the Steele router has been configured with the frame-relay encapsulation ietf command.

D. The frame-relay map statement in the Attalla router for the PVC to Steele is not correct.

E. The IP address on the serial interface of the Attalla router is configured incorrectly.

Answer: D

解释一下：这个图中的PVC建立有问题的，先看Gallan的map映射：只有到Steele：172.31.31.126的映射；再来看Steele的映射：也只有到自己的映射，所以Gallan到Steele的连通性就有问题了，Gallan可以将包发送到Steele，但是Steele回包的时候无法完成封装，连通性失败了。而且他们两个都没有到Attalla的映射，所以也无法和Attalla建立连通性。





4. What three pieces of information can be used in an extended access list to filter traffic? (Choose three.)

A. protocol

B. VLAN number

C. TCP or UDP port numbers

D. source switch port number

E. source IP address and destination IP address

F. source MAC address and destination MAC address

Answer: ACE

解释一下：ACL是基于三层的过滤，因此他可以基于ip，port number来过滤流量，扩展的访问控制列表是可以基于源和目的的同时的过滤。





5. Which of the following statements describe the network shown in the graphic? (Choose two.)

  

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A. There are two broadcast domains in the network.

B. There are four broadcast domains in the network.

C. There are six broadcast domains in the network.

D. There are four collision domains in the network.

E. There are five collision domains in the network.

F. There are seven collision domains in the network.

Answer: AF

解释一下：这是个广播域和冲突域的问题。首先我们需要知道HUB整体是一个广播域和冲突域，而交换机整体是一个广播域，每个接口都是一个冲突域。知道了这些，这个问题的答案就很明显了，有两个广播域和七个冲突域。

拔腿就跑

解释一下：串行接口的状态为一个up一个down，出现的可能的情况有：没有收到keeplive的报文，或是接口的时钟频率没有设置，或是接口封装不匹配，这些都有可能导致接口的链路层为down的。

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thanks 讲解很好，有助于学习