Computer Networking
Which of the following communications modes support two-way traffic but in only one direction of a time?

half-duplex
None of these
simplex
three-quarters duplex
full-of the above

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Computer Networking
The packets switching concept was first proposed

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

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