Computer Networking
A T-switch is used to

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

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Computer Networking
Which of the following refers to the terms "residual error rate"?

The probability that one or more errors will be undetected when an error detection scheme is used
signal to noise ratio divided by the ratio of energy per bit to noise per hertz
the probability that one or more errors will be detected when an error detection mechanism is used
the number of bit errors per twenty four hours of continuous operation on an asynchronous line
None of these

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Computer Networking
A WATS arrangement

is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is always less expensive than flat-rate service
is never less expensive than flat-rate service
None of these
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long

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