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

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 probability that one or more errors will be undetected when an error detection scheme 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
The data-link layer, in reference to the OSI model, specifies

the interface between the X.25 network and packet mode device
All of these
the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these

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Computer Networking
A T-switch is used to

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

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