Computer Networking
Communication circuits that transmit data in both directions but not at the same time are operating in

a half-duplex mode
a simplex mode
None of these
an asynchronous mode
a full-duplex mode

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Computer Networking
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."

The administrator has the interface shut down.
The administrator is pinging from the interface.
No cable is attached.
The keepalives are different times.

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