Question

What is route poisoning?

(a) It sends back the protocol received from a router as a poison pill, which stops the regular updates. The use of variable length subnet masks is permitted

(b) It is information received from a router that can’t be sent back to the originating router.RIPv2 supports classless routing

(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

This question was posed to me in semester exam.

The doubt is from RIP v2 in portion Networking of Computer Network

Answer 1

The correct option is (d) It describes when a router sets the metric for a downed link to infinity

Easy explanation: When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable.