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Difficulty: EasyOSPFv2 Neighbor Adjacencies and Router ID

Which TWO parameters in OSPFv2 Hello packets must match between two neighboring Cisco routers for them to successfully form an OSPF neighbor adjacency? (Select TWO.)

  1. OSPF Area IDAnswer
  2. Hello and Dead timer intervalsAnswer
  3. C
    OSPF Router ID
  4. D
    OSPF Process ID

Answer

The OSPF Area ID and the Hello/Dead timer intervals must match between neighboring routers to establish an OSPF adjacency.
For two routers to establish an OSPFv2 neighbor adjacency, key configuration parameters exchanged in Hello packets must match. Specifically, the Area ID and the Hello/Dead timer intervals must be identical on both sides of the link.

Step-by-Step Solution

1
Identify OSPF neighbor adjacency requirements
Neighboring routers exchange Hello packets containing configuration parameters.
For an OSPF adjacency to reach FULL state, specific fields in the Hello packet must match on both routers.
2
Evaluate the parameters
Area ID and Hello/Dead timer intervals are mandatory matching parameters.
Router IDs must be unique per router, and Process IDs are only locally significant.

Key Concept

OSPFv2 Hello Packet Adjacency Requirements
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Topics

OSPFv2 Neighbor Adjacencies and Router ID

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