单选

Which line from the output of the show ip interface command indicates that there is 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
  • E.None of the above
参考答案
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