Computer Networking
The application layer of a network

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

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Computer Networking
MAC is

network access standard for connecting stations to a circuit-switched network
None of these
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued to ISO.
a method access control technique or multiple-access transmission media

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