Computer Networking
The packets switching concept was first proposed

All of these
None 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
Contention is

the condition when two or more stations attempt to use the same channel at the same time
None of these
a collection of interconnected functional units that provides a data communications service among stations attached to the network
a continuous frequency capable of being modulated or impressed with a second signal
One or more conductors that serve as a common connection for a related group of devices

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