Computer Networking
What is split horizon?

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.
Information about a route should not be sent back in the direction from which the original update came.
It holds the regular updates from broadcasting to a downed link.

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Computer Networking
What command is used to stop RIP routing updates from exiting out an interface but still allow the interface to receive RIP route updates?

Router (config-if) # passive-interface
Router (config-router) # passive-interface s0
Router (config-router) # no routing updates
Router (config-if) # no routing

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