Computer Networking
Demodulation is a process of

converting digital to analog signals
converting analog to digital signals
performing data description.
multiplexing various signals into one high speed line signals

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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."

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

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