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

a check bit appended to an array of binary digits to make the sum of the all the binary digits
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

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Computer Networking
HMP (Host Monitoring Protocol) is:

None of these
a protocol used to monitor computers
a protocol that handles error and control messages
a TCP/IP high level protocol for transferring files from one machine to another.
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address

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