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

None of these
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
a set of physical layer standards developed by EIA and intended to replace RS-232-
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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Computer Networking
The application layer of a network

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

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