Cisco Certified Network Associate (CCNA)

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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 up
B.Serial0/1 is up, line protocol is down
C.Serial0/1 is down, line protocol is down
D.Serial0/1 is administratively down, line protocol is down

Correct:C
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