Refer to the exhibit, which shows information about an OSPF interface of hub router NGFW-1. How would you change the interface state of NGFW.1 to a Designated router, if the spoke routers have the…

Question

Exhibit

Options

• AChange the network type to point-to-multipoint
• BChange the router ID to 0.0.0.65
• CChange the router ID to 0.0.0.95
• DChange the router priority to 200

• A
  4% (1)
• B
  4% (1)
• C
  9% (2)
• D
  83% (19)

Explanation

Setting NGFW-1's OSPF priority to 200 guarantees it wins the DR election because OSPF elects the DR based on highest priority first, with Router ID only used as a tiebreaker. Since spoke routers use the default priority of 1, any value above 1 on NGFW-1 would win - 200 is an unambiguous choice.

Why the distractors are wrong:

• A (point-to-multipoint): This network type eliminates DR/BDR election entirely - no DR is elected on point-to-multipoint segments, which is the opposite of the goal.
• B & C (change Router ID): Router ID is only a tiebreaker when priorities are equal. If NGFW-1's current priority is the same as the spokes (both at default 1), the Router ID matters - but we don't know the spokes' Router IDs, and the question says to use default parameters. There's no guarantee 0.0.0.65 or 0.0.0.95 would be the highest across all routers.

Memory tip: Think "Priority over ID" - OSPF DR election is a two-round contest: Round 1 is priority (higher wins), Round 2 (tiebreaker only) is Router ID. To guarantee DR status, always control the priority, not just the Router ID.

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