Computer Networking
A front-end processor is

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

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Computer Networking
A WATS arrangement

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

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