Computer Networking
The method of communication in which transmission takes place in both directions, but only one direction at a time is called

Simplex
Half Duplex
Full Duplex
Four wire circuit

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Computer Networking
Error rate is

a check bit appended to an array of binary digits to make the sum of all the binary digits.
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
None of these
the ratio of the number of data units in error to the total number of data units

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