Computer Networking
The network layer, in reference to the OSI model, provide

None of these
the interface between the X.25 network and packet mode device
All of these
the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received

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Computer Networking
Demodulation is the process of

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

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