Computer Networking
The physical layer, in reference to the OSI model, defines

the virtual circuit interface to packet-switched service
None of these
All of these
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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Computer Networking
Modulation is the process of

converting analog signals to digital signals
converting digital signals to analog signals
performing data encryption.
Multiplexing various signals into high speed line signals

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