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
None of these
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
signal to noise ratio divided by the ratio of energy per bit to noise per hertz

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Computer Networking
A front-end processor is

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

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