Discussion
What is split horizon?
Answer: A
Correct answer: Information about a route should not be sent back in the direction from which the original update came.
Split horizon is a loop prevention rule: a router does not advertise a route back out of the interface it learned it on, since the neighbour there already has a better path and would otherwise be told about its own route at a worse metric. It is one of several such mechanisms in RIP, alongside route poisoning, hold-down timers and triggered updates.
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