Computer Networking
The application layer of a network

establishes, maintains, and terminates virtual circuits
consists of software being run on the computer connected to the network
defines the user's port into the network
All of these
None of these

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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
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

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