Computer Networking
The data communication support should include, but is not restricted to

terminal support, electronic mail and voice grams.
All of these
file transfer and transaction processing
file and database access

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Computer Networking
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
Information about a route should not be sent back in the direction from which the original update came.
It prevents regular update messages from reinstating a route that has gone down.
It splits the traffic when you have a large bus (horizon) physical network.

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