In the Init state of the OSPF-enabled router, the destination address for sending Hello packets is ____.

Question

Options

• A224.0.0.5
• B
• C
• D

• A
  85% (17)
• B
  10% (2)
• D
  5% (1)

Explanation

Option A (224.0.0.5) is correct because OSPF Hello packets are always sent to the AllSPFRouters multicast address 224.0.0.5, regardless of which OSPF neighbor state the router is currently in, including Init. This multicast address ensures every OSPF-enabled router on the same network segment receives the Hello without requiring individual unicast transmissions. The Init state means the local router has received a Hello from a neighbor but has not yet seen its own Router ID included in that neighbor's Hello - it continues sending Hellos to 224.0.0.5 until the two-way relationship is established. The distractor options (B, C, D) are not shown in this version of the question, but a common wrong choice is 224.0.0.6, which is the AllDRouters address used only by non-DR/BDR routers to communicate with the Designated Router and Backup Designated Router.

Memory tip: Think "5 for all OSPF speakers" - 224.0.0.5 reaches every OSPF router, while 224.0.0.6 is the narrower address for DR/BDR communication only.

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