Computer Networking
The packets switching concept was first proposed

None of these
All of these
in the early 1960s for military communication systems, mainly to handle speech
in the late 1980s for the Defense Ministry of US.
in the late 1950s for Defense Ministry of US

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Computer Networking
A front-end processor is

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

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