Computer Networking
A modem that is attached to the telephone system by jamming the phone's handset into two flexible receptacles in the coupler?

bridge
time-division multiplexer
acoustic coupler
None of these
gateway

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

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