Examkin

Question

Difficulty: EasyOSPFv2 Neighbor Adjacencies and Router ID

A network engineer is configuring OSPFv2 on two directly connected routers. Which TWO parameters must match identically in the OSPF Hello packets exchanged between the routers for a neighbor adjacency to form successfully? (Select TWO.)

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

Answer

The parameters that must match identically in OSPF Hello packets are the Area ID and the Hello and Dead timer intervals.
For two OSPFv2 routers to form an adjacency, they must agree on key interface configuration parameters transmitted in Hello packets. Both the Area ID and the Hello/Dead timer intervals are mandatory matching fields. If any of these fields differ, the routers will ignore or drop the Hello packets and remain unable to form a neighbor relationship.

Step-by-Step Solution

1
Analyze OSPF Hello packet fields required for neighbor adjacency formation.
Identify parameters carried in Hello packets that undergo validation upon receipt.
OSPF routers verify specific fields in incoming Hello packets before allowing neighbor state transitions.
2
Evaluate mandatory matching parameters versus non-matching parameters.
Area ID and Hello/Dead timer intervals must match. Router IDs must be unique, and Process IDs are locally significant only.
Matching Area IDs ensure routers agree on network membership, and matching timers maintain synchronized keepalive expectations.

Key Concept

OSPFv2 Neighbor Adjacency Requirements
Rate this question

Topics

OSPFv2 Neighbor Adjacencies and Router ID

More questions from this topic