What is route poisoning?

Question

Options:

A . It sends back the protocol received from a router as a poison pill, which stops the regular updates.

B . It is information received from a router that can't be sent back to the originating router.

C . It prevents regular update messages from reinstating a route that has just come up.

D . It describes when a router sets the metric for a downed link to infinity.

Answer: Option D

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