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

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

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Computer Networking
Bus is

a continuous frequency capable of being modulated or impressed with a second signal
a collection of interconnected functional units that provides a data communications service among stations attached to the network
the condition when two or more stations attempt to use the same channel at the same time
one or more conductors that some as a common connection for a related group of devices
None of these

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