2. 计算机
  3. Refer to the exhibit． Host in network 192．168．2．0 are unable to reach hosts in network 192．168．3．0． Based on the output from Rou

Refer to the exhibit． Host in network 192．168．2．0 are unable to reach hosts in network 192．168．3．0． Based on the output from Rou

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问题 Refer to the exhibit． Host 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?
选项 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 encapsulation that is configured on S0/0 of RotuerB does not match the encapsulation that is configured on S0/0 of RouterA．
E、        Interface S0/0 on RouterA is not receiving a clock signal from the CSU/DSU．
答案D,E
解析 由图示可知RA和RB之间端口的协议处于down状态。一般是时钟或者封装等问题。
A：线路故障，错误。因为物理层是up 的
B：管理性down，错误。
C：子网配置不正确，错误。这个不影响端口状态。
D：封装不匹配，正确。
E：RA没有接受到时钟信息，正确。
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