Computer Networking
Demodulation is the process of

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

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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