单选题Which line from the output of the show ip interface command indicates a layer 1 problem?（）ASerial0/1 is up, line protocol is downBSerial0/1 is down, line protocol is downCSerial0/1 is up, line protocol is upDSerial0/1 is administratively down, line protocol is down
单选题
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
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