Computer Networking
Error detecting code is

the ratio of the data units in error to the total number of data units
a code in which each expression conforms to specify rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
an error-detecting code based on a summation operation performed on the bits to be checked
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
Synchronous protocols

transmit characters one at a time
None of these
allow faster transmission than asynchronous protocols do
are generally used by personal computers
are more reliable

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