Computer Networking
Error detecting code is

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
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

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Computer Networking
A T-switch is used to

echo every character that is received
transmit characters one at a time
rearrange the connections between computing equipment
control how messages are passed between computers
None of these

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