IOS and Security Device Manager

What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

A No cable is attached.

B The keepalives are different times.

C The administrator is pinging from the interface.

D The administrator has the interface shut down.

ANS:B - The administrator has the interface shut down.

If an interface is shut down, the show interface command will show the interface as administratively shut down. (It is possible that no cable is attached, but you can't tell that from this message.)

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