Nokia Certified Associate – Cloud — Question 1

A router running a link-state routing protocol detects that one of its neighbors is no longer connected to it. The router generates a new link-state advertisement to inform other routers of the topology change. Which of the following is NOT an action that is triggered by this event?

Answer options

• A. If a router receives the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.
• B. If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
• C. Every router that receives the new link-state advertisement updates its age field before forwarding it.
• D. Every router that receives the new link-state advertisement runs the SPF algorithm to recalculate its shortest-path tree and its forwarding database.

Correct answer: C

Explanation

The correct answer is C because routers do not update the age field before forwarding the advertisement; they forward it as received. Options A, B, and D describe valid actions taken by routers when they receive a link-state advertisement, including acknowledgment, ignoring duplicate advertisements, and running the SPF algorithm to update routing information.