H12-821_V1.0 · Question #798
When the routers exchange database information through DD messages, a master-slave relationship is first formed. The one with the larger DR Priority becomes the master router, and its master-slave…
The correct answer is B. FALSE. B is correct because the master-slave relationship in OSPF Database Description (DD) exchange is determined by Router ID (RID), not DR Priority. The router with the higher Router ID becomes the master and sets the MS bit to 1; the lower-RID router becomes the slave with MS = 0…
Question
Options
- ATRUE
- BFALSE
How the community answered
(25 responses)- A20% (5)
- B80% (20)
Explanation
B is correct because the master-slave relationship in OSPF Database Description (DD) exchange is determined by Router ID (RID), not DR Priority. The router with the higher Router ID becomes the master and sets the MS bit to 1; the lower-RID router becomes the slave with MS = 0.
Why A is wrong: DR Priority governs a completely separate election - choosing the Designated Router (DR) and Backup DR (BDR) on multi-access segments. Conflating DR Priority with the DD master-slave election is a common trap; they are independent mechanisms serving different purposes.
Memory tip: Think "Master = Most significant Router ID." The router that would win a "highest number" contest takes the master role in DD exchange - DR Priority has no vote here.
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