Computer Networking
After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. What is it called?

Facsimile
None of these
Word processor
Electronic mail
Telex

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

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Computer Networking
The packets switching concept was first proposed

None of these
All 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.

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