Quiz 3 - question 8

Quiz 3 - question 8

par Bryan Marcel Gotti,
Number of replies: 2

Hello,

Regarding the question 8 of quiz 3:

Why might the forwarding table of an IP router change?

a. Because a link failed.
b. Because the local Autonomous System (AS) changed its intra-domain routing protocol from Bellman-Ford to Disjkstra.
c. Any of the above.

I think answer c. should be correct, since when changing routing protocol, we are not guaranteed there exists a unique optimal solution to the routing problem. Thus Disjkstra might converge to another (also optimal) solution, different from the one found through Bellman-Ford. In that situation, the forwarding table might also change because of a change in routing protocol (meaning c. is correct)

Is my reasoning correct ?

In reply to Bryan Marcel Gotti

Re: Quiz 3 - question 8

par Katerina Argyraki,
Yes, this reasoning is correct. More sophisticated than expected, but correct :)
In reply to Katerina Argyraki

Re: Quiz 3 - question 8

par Katerina Argyraki,
Just to clarify: It does happen occasionally that I create a quiz question based on the simple scenarios we discuss in class, not considering that some of you may want to think beyond these simple scenarios.