Computer Networking
Error rate is

the ratio of the number of data units in error to the total number of data units
an error-detecting code based on a summation operation performed on the bits to be checked.
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 check bit appended to an array of binary digits to make the sum of all the binary digits.
None of these

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Computer Networking
HMP (Host Monitoring Protocol) is:

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

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