Computer Networking
Demodulation is the process of

converting digital signals to analog signals
converting analog signals to digital signals
dividing the high-speed signals into frequency bands
None of these
combining many low speed channels into one high speed channel

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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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