Computer Networking
The packets switching concept was first proposed

All of these
in the late 1950s for Defense Ministry of US
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.

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Computer Networking
Which statement describes a spanning-tree network that has converged?

All switch and bridge ports are in either the forwarding or blocking state.
All switch and bridge ports are either blocking or looping.
All switch and bridge ports are in the forwarding state.
All switch and bridge ports are assigned as either root or designated ports.

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