Computer Networking
Modulation is the process of

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

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Computer Networking
MAC is

a very common bit-oriented data link protocol issued to ISO.
network access standard for connecting stations to a circuit-switched network
None of these
a method of determining which device has access to the transmission medium at any time
a method access control technique or multiple-access transmission media

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