Computer Networking
MAC is

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

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Computer Networking
Demodulation is the process of

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

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