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

the ratio of the number of data units in error to the total number of data units
a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
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

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Computer Networking
An encyclopedic database

All of these
None of these
is generally free
is easy for beginners to use
is an information utility that specializes in storing and searching information

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