200-101 · Question #68
200-101 Question #68: Real Exam Question with Answer & Explanation
The correct answer is B: Hellos are sent every 10 seconds.. After OSPF convergence, routers do NOT stop communicating. They continue exchanging (B) Hello packets every 10 seconds (on broadcast and point-to-point links) to maintain neighbor adjacencies and detect link failures. If a router misses a neighbor's hellos for the dead interval (
Question
Options
- ANo messages are exchanged.
- BHellos are sent every 10 seconds.
- CThe full database from each router is sent every 30 seconds.
- DThe routing table from each router is sent every 60 seconds.
Explanation
After OSPF convergence, routers do NOT stop communicating. They continue exchanging (B) Hello packets every 10 seconds (on broadcast and point-to-point links) to maintain neighbor adjacencies and detect link failures. If a router misses a neighbor's hellos for the dead interval (typically 40 seconds, or 4x the hello interval), it declares the neighbor down and begins reconvergence. The full LSA database (C) is only exchanged during initial adjacency formation, not periodically after convergence. Routing tables (D) are not directly exchanged in OSPF - topology data via LSAs is, and each router independently calculates its own routing table using SPF.
Community Discussion
No community discussion yet for this question.