Computer Networking
Communication network is

None of these
one or more conductors that serve as a common connection for a related group of devices
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 with two or more stations attempt to use the same channel at the same time

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Computer Networking
MAC is

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
network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
None of these

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