Computer Networking
The application layer of a network

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

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Computer Networking
RS-449/442-A/423-A is

a set of physical layer standards developed by EIA and intended to replace RS-232-
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
None of these
the ratio of the number of data units in error to the total number of data units
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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