H12-821_V1.0 · Question #834
In network A, the two DRother devices will not establish an adjacency relationship, and their status will remain in 2-way.
The correct answer is A. TRUE. Option A is correct because in OSPF, DRother routers only form full adjacencies with the DR (Designated Router) and BDR (Backup Designated Router) - never with each other. Two DRother routers exchange Hello packets and recognize each other as neighbors, which brings them to…
Question
Options
- ATRUE
- BFALSE
How the community answered
(38 responses)- A71% (27)
- B29% (11)
Explanation
Option A is correct because in OSPF, DRother routers only form full adjacencies with the DR (Designated Router) and BDR (Backup Designated Router) - never with each other. Two DRother routers exchange Hello packets and recognize each other as neighbors, which brings them to 2-Way state, but they stop there and do not proceed through the remaining OSPF adjacency stages (ExStart, Exchange, Loading, Full).
Option B is wrong because it contradicts a core OSPF design principle: the DR/BDR election exists precisely to reduce the number of adjacencies on a multi-access network (like Ethernet). Without this rule, every router would need a full adjacency with every other router, creating O(n²) adjacencies.
Memory tip: Think of the DR/BDR as a "hub" - DRother routers are like spokes that only connect to the hub (DR/BDR), never to each other. The 2-Way state between DRothers is OSPF saying "I see you, but I'm not talking to you directly."
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