Computer Networking
End-to-end connectivity is provided from host-to-host in:

Session layer
Data link layer
Network layer
None of these
Transport layer

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Computer Networking
What is split horizon?

It prevents regular update messages from reinstating a route that has gone down.
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 splits the traffic when you have a large bus (horizon) physical network.

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