H12-821_V1.0 · Question #909
If OSPF is in the ExStart state, routers and neighbors send DD messages containing link status information digests to each other.
The correct answer is B. FALSE. B is correct because in the ExStart state, routers exchange empty DD (Database Description) packets solely to elect a master/slave relationship and agree on an initial DD sequence number - no actual link state information is shared yet. Why A is wrong: The description in the…
Question
Options
- ATRUE
- BFALSE
- C
- D
How the community answered
(39 responses)- A5% (2)
- B72% (28)
- C8% (3)
- D15% (6)
Explanation
B is correct because in the ExStart state, routers exchange empty DD (Database Description) packets solely to elect a master/slave relationship and agree on an initial DD sequence number - no actual link state information is shared yet.
Why A is wrong: The description in the question accurately describes the Exchange state, not ExStart. It's during Exchange that routers send DD packets containing LSA (Link State Advertisement) headers/digests summarizing their link-state databases.
Memory tip: Think of it as two sequential steps - ExStart = "Start negotiating" (who's boss, what sequence number), then Exchange = "Exchange the actual data". The names hint at the order and purpose: establish control first, share content second.
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