Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?

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问题 Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?

选项 A、Serial0/1 is up, line protocol is down
B、Serial0/1 is down, line protocol is down
C、Serial0/1 is up, line protocol is up
D、Serial0/1 is administratively down, line protocol is down
E、None of the above

答案B

解析 Explanation:
When the physical interface itself is down, then the problem is related to layer 1. When it is up, but the line protocol is down, then the problem is related to layer 2.

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Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?

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