Computer Networking
Which of the following does not allow multiple users or devices to share one communications line?

concentrator
multipplexer
controller
doubleplexer
None of these

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Computer Networking
The packets switching concept was first proposed

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

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