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

time-division multiplexer
acoustic coupler
gateway
None of these
bridge

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

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