Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

None of these
can receive and send data simultaneously
cannot talk at once
can send or receive data one at a time
can do one way data transmission only

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Computer Networking
A front-end processor is

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

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