Computer Networking
Modulation is the process of

converting digital signals to analog signals
converting analog signals to digital signals
Multiplexing various signals into high speed line signals
performing data encryption.

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Computer Networking
A front-end processor is

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

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