Computer Networking
MAC is

None of these
a very common bit-oriented data link protocol issued to ISO.
a method access control technique or multiple-access transmission media
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

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Computer Networking
Bulletin board system

is a public access message system
None of these
converts analog signals to digital signals
converts digital signals to analog signals
is a modem capable of accepting commands

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