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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
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
What is route poisoning?a)It sends back the protocol received from a r...
Answer: d
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.
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What is route poisoning?a)It sends back the protocol received from a r...
Route Poisoning:
Route poisoning is a technique used in distance-vector routing protocols to prevent routing loops and ensure efficient routing in a network.

Explanation:
- Definition: Route poisoning involves a router setting the metric for a downed link to infinity, making the route unusable. This prevents regular update messages from reinstating a route that has just come up.
- Preventing Routing Loops: By setting the metric to infinity for a downed link, route poisoning helps in preventing routing loops. It informs other routers in the network that the route is no longer available.
- Efficient Routing: Route poisoning helps in quickly propagating information about a failed link throughout the network, allowing routers to update their routing tables and find alternative paths.
- Example: For example, in a network using the RIP (Routing Information Protocol) routing protocol, when a router detects that a link has failed, it sends an update with a metric of 16 (infinity) to inform other routers about the unavailability of that route.
- Impact on Convergence: Route poisoning helps in faster convergence of the network by promptly updating routing tables when a link goes down.
- Protocol Support: Route poisoning is commonly used in distance-vector routing protocols like RIP to maintain network stability and prevent routing anomalies.
In conclusion, route poisoning plays a crucial role in ensuring efficient and loop-free routing in network environments using distance-vector routing protocols by marking failed routes as unreachable with an infinite metric.
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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 permittedb)It is information received from a router that can’t be sent back to the originating router.RIPv2 supports classless routingc)It prevents regular update messages from reinstating a route that has just come upd)It describes when a router sets the metric for a downed link to infinityCorrect answer is option 'D'. Can you explain this answer?
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