Computer Networking
Demodulation is a process of

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

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

None of these
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
the interface between the X.25 network and packet mode device

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