Multiple choice

A fully converged five OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router looses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?

  1. All routes for the entire network will be present.

  2. Directly connected networks that are operational will be in the routing table.

  3. Because the SPF algorithm has not completed all calculations, no routes will be in the table.

  4. A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a router reboots, the startup configuration is loaded but OSPF has not yet exchanged hello packets or built its neighbor adjacencies. Until OSPF convergence completes, the routing table only contains directly connected networks that are operationally up. All OSPF-learned routes from other networks are temporarily absent until the SPF algorithm runs and LSPs are exchanged. The router cannot have remote routes before convergence completes.

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