Computer Networking
The application layer of a network

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

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Computer Networking
Contention is

None of these
a continuous frequency capable of being modulated or impressed with a second signal
the condition when two or more stations attempt to use the same channel at the same time
a collection of interconnected functional units that provides a data communications service among stations attached to the network
One or more conductors that serve as a common connection for a related group of devices

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