Computer Networking
MAC is

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

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Computer Networking
A front-end processor is

None of these
a processor in a large-scale computer that executes operating system instructions
preliminary processor of batch jobs.
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
a user computer system

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