H12-821_V1.0 · Question #731
In OSPF, if the network type is NBMA or broadcast and there are two or more routers, DR and BDR must be specified.
The correct answer is B. FALSE. B is correct because on NBMA and broadcast network types, OSPF automatically elects a DR (Designated Router) and BDR (Backup Designated Router) through the election process - you don't manually "specify" them. The election uses router priority and Router ID to determine…
Question
Options
- ATRUE
- BFALSE
How the community answered
(16 responses)- A13% (2)
- B88% (14)
Explanation
B is correct because on NBMA and broadcast network types, OSPF automatically elects a DR (Designated Router) and BDR (Backup Designated Router) through the election process - you don't manually "specify" them. The election uses router priority and Router ID to determine winners, so DRs and BDRs emerge dynamically, not through manual designation.
Why A is wrong: Saying DR/BDR "must be specified" confuses the election process with static configuration. While you can influence the election by setting interface priorities (e.g., ip ospf priority), OSPF handles the selection automatically. You never truly specify a DR/BDR the way you'd assign a static IP.
Memory tip: Think of DR/BDR as an elected office, not an appointed one. OSPF holds an election on broadcast and NBMA segments - no administrator decree required. If you remember "elected, not appointed," you'll avoid confusing automatic election with manual specification.
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