Multiple choice

Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator notices that the route is still valid in the routing table of Router1. How much longer will it take for Router1 to mark the route invalid by setting the metric to 16?

  1. 30 seconds

  2. 90 seconds

  3. 155 seconds

  4. 180 seconds

  5. 255 seconds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

RIP uses a 180-second invalid timer. If a route is not refreshed (no update received) within 180 seconds, it is marked invalid and the metric is set to 16 (unreachable). This is followed by a 240-second flush timer before the route is completely removed from the routing table.

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