试题详情
- 单项选择题Which line from the output of the show ip interface command indicates a layer 1 problem?（）
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
- B
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