Computer Networking
A front-end processor is

a user computer system
None of these
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
preliminary processor of batch jobs.
a processor in a large-scale computer that executes operating system instructions

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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
None of these
rearrange the connections between computing equipment
transmit characters one at a time

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

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 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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