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

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

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Computer Networking
RS-232-G

specifies only the mechanical characteristics of an interface by providing a 25-pin connector
requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
None of these
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
is an interface between two data circuit terminating equipment as examplified by a local and remote modem

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Computer Networking
A T-switch is used to

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

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