Computer Networking
Modulation is the process of

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

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

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

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