Computer Networking
A modem that is attached to the telephone system by jamming the phone's handset into two flexible receptacles in the coupler?

bridge
gateway
time-division multiplexer
acoustic coupler
None of these

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

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

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