Computer Networking
Baseband is

the simultaneous transmission of data to a number of stations
a signal all of whose energy is contained within a finite frequency range
transmission of signals without modulation
None of these
All of these

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Computer Networking
HDLC (High-level Data Link Control) is

network access standard for connecting stations to a circuit-switched network
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
a very common bit-oriented data link protocol issued by ISO.
None of these

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