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What is split horizon?

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

Correct Answer: Information about a route should not be sent back in the direction from which the original update came.

Explanation:

A split horizon will not advertise a route back to the same router it learned the route from.

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