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Difficulty: EasyOSPFv2 Network Types and DR/BDR Selection

Match each OSPFv2 network type or election property on the left to its corresponding default operation or behavior on the right.

  • Broadcast MultiaccessElects a DR/BDR and defaults to 10-second Hello and 40-second Dead timers.
  • Point-to-PointForms neighbor adjacency without electing a DR/BDR, using 10-second Hello and 40-second Dead timers.
  • Interface Priority 0Excludes the router interface from participating in Designated Router elections completely.
  • Equal Priority Tie-BreakerUses the highest OSPF Router ID to select the Designated Router.

Answer

Broadcast Multiaccess matches electing a DR/BDR with 10s/40s timers; Point-to-Point matches forming adjacencies without DR/BDR election with 10s/40s timers; Interface Priority 0 matches excluding the router from DR elections; Equal Priority Tie-Breaker matches using the highest Router ID.
Each OSPF network type operates with specific election rules and default timers under standard Cisco OSPFv2 behavior: Broadcast multiaccess requires a DR/BDR with 10-second Hello timers; Point-to-Point bypasses DR selection with 10-second Hello timers; priority 0 excludes a device from election; and highest Router ID breaks priority ties.

Step-by-Step Solution

1
Determine which OSPFv2 network types perform DR/BDR election.
Broadcast multiaccess networks elect DR/BDR, whereas Point-to-Point networks bypass DR/BDR election.
DR/BDR selection is only required on multiaccess media to minimize full mesh neighbor adjacencies.
2
Evaluate the impact of configuring an interface priority of 0.
The router interface is disqualified from DR and BDR elections.
An interface priority value of 0 explicitly instructs OSPF to keep the interface in DROTHER status regardless of Router ID.
3
Identify the deterministic tie-breaker for DR elections when priorities match.
The router with the highest OSPF Router ID is elected.
OSPF DR election precedence evaluates interface priority first, followed by the highest Router ID.

Key Concept

OSPFv2 Network Types and DR/BDR Selection Rules
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Topics

OSPFv2 Network Types and DR/BDR Selection

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