Computer Networking
Synchronous protocols

None of these
transmit characters one at a time
are generally used by personal computers
are more reliable
allow faster transmission than asynchronous protocols do

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Computer Networking
A front-end processor is

preliminary processor of batch jobs.
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

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