Which line from the output of the show ip interface command indicates a layer 1 problem?（）A、Serial0/1 is up, line protocol is downB、Serial0/1 is down, line protocol is downC、Serial0/1 is up, line protocol is upD、Serial0/1 is administratively down, line protocol is down
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
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