Which OSPF network type does not perform DR/BDR elections?

Which OSPF network type does not perform DR/BDR elections?

• A. Point-To-Point
• B. Nonbroadcast
• C. Broadcast
• D. Point-To-Multipoint

Answer: (A)

DR/BDR elections happen only on networks where many routers share the same medium, so a designated router is chosen to coordinate how LSAs are flooded. A point-to-point link has exactly two endpoints, so there’s no need for a central router to manage floods—each router simply forms a direct adjacency with its neighbor and exchanges routing information over that single link. That’s why this network type does not perform DR/BDR elections. On networks like broadcast (Ethernet) or nonbroadcast multi-access, multiple routers share the same segment, so a DR and a BDR are elected to optimize flooding and reduce the number of adjacencies. Point-to-multipoint configurations avoid a single DR/BDR in practice, but the classic, straightforward case where DR/BDR is clearly unnecessary is the point-to-point link.

DR/BDR elections happen only on networks where many routers share the same medium, so a designated router is chosen to coordinate how LSAs are flooded. A point-to-point link has exactly two endpoints, so there’s no need for a central router to manage floods—each router simply forms a direct adjacency with its neighbor and exchanges routing information over that single link. That’s why this network type does not perform DR/BDR elections.

On networks like broadcast (Ethernet) or nonbroadcast multi-access, multiple routers share the same segment, so a DR and a BDR are elected to optimize flooding and reduce the number of adjacencies. Point-to-multipoint configurations avoid a single DR/BDR in practice, but the classic, straightforward case where DR/BDR is clearly unnecessary is the point-to-point link.