Computer Networking
The method of communication in which transmission takes place in both directions, but only one direction at a time is called

Simplex
Four wire circuit
Full Duplex
Half Duplex

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Computer Networking
A front-end processor is

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

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