Computer Networking
Packet Switch Stream (PSS) was introduced in

the US in 1961 (&) the UK in 1981
None of these
the UK in 1980
the US in 1961
None of these

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Computer Networking
A front-end processor is

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

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