IP Routing

Q1: What is route poisoning?

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

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

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

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

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

Another way to avoid problems caused by inconsistent updates and to stop network loops is route poisoning. When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable (sometimes referred to as infinite).



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