The show interfaces serial 0/0 command resulted in the output shown in the graphic. What are possible causes for this interface

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问题 The show interfaces serial 0/0 command resulted in the output shown in the graphic. What are possible causes for this interface status?

选项 A、The interface is shut down.
B、No keepalive messages are received.
C、The clockrate is not set.
D、No loopback address is set.
E、There is a mismatch in the encapsulation type.

答案B,C,E

解析 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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