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1) compare priority, the higher priority will be elected as the DR.
2) If there is a tie, compare interface, the highest will be DR.
In this case Router A and B, have the highest priority. Then comparing interfaces, Router B will be the DR and Router A the BDR.
https://support.huawei.com/enterprise/en/doc/EDOC1000178171/50e7f6e0/example-for-configuring-ospf-dr-election
The election process for a Designated Router (DR) in OSPF involves several factors and follows a specific order:
Each OSPF router has a configurable priority value (default: 1).
The router with the highest priority is elected as the DR.
If multiple routers have the same priority, the tiebreaker is the lowest Router ID.compared to other data link layer protocols like Ethernet.
Router A is the DR. Router B is the BDR. The answer is B.
The answer is B because In an OSPF network, the BDR (Backup Designated Router) is responsible for maintaining a backup role in case the DR (Designated Router) fails. The DR and BDR are elected on each multi-access network (such as Ethernet) to efficiently synchronize the LSDB (Link-State Database). Here’s how the election works:
Router A is the DR (Designated Router).
Router B is the BDR (Backup Designated Router).
Router C and Router D are DROTHERs (routers that are neither DR nor BDR).
Therefore, the answer to your question is B. Router B
The BDR (Backup Designated Router) is then elected based on the second highest OSPF priority or second highest Router ID if there is a tie in OSPF priority among remaining routers after DR election.
So in this case, after Router A is elected as the DR, Router B would be elected as the BDR because it has the second highest OSPF priority and second highest Router ID among remaining routers.
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