Computer Networking
X.21 is

None of these
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO
a method access control technique for multiple-access transmission media
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
combining many low speed channels into one high speed channel
None of these
converting analog signals to digital signals
dividing the high-speed signals into frequency bands

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