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Which multicast address does the OSPF Hello protocol use?
  • a)
    224.0.0.5
  • b)
    224.0.0.6
  • c)
    224.0.0.7
  • d)
    224.0.0.8
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which multicast address does the OSPF Hello protocol use?a)224.0.0.5b)...
Answer: a
Explanation: 224.0.0.5 is the multicast address does the OSPF Hello protocol use.
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Most Upvoted Answer
Which multicast address does the OSPF Hello protocol use?a)224.0.0.5b)...
Introduction to OSPF Hello Protocol
The OSPF (Open Shortest Path First) protocol is a widely used routing protocol in IP networks. One of its key components is the Hello protocol, which is essential for establishing and maintaining neighbor relationships between OSPF routers.
Multicast Address Used by OSPF
OSPF utilizes specific multicast addresses for its communication:
  • 224.0.0.5 - This address is used for sending Hello packets to all OSPF routers in a network.
  • 224.0.0.6 - This address is used for sending OSPF packets specifically to designated routers (DR).

Significance of 224.0.0.5
The use of the multicast address 224.0.0.5 allows OSPF routers to efficiently communicate with all other OSPF routers on the same network segment without the need for broadcasting:
  • Efficiency: Multicasting reduces network traffic compared to broadcasting, as packets are sent only to interested receivers.
  • Neighbor Discovery: The Hello packets sent to 224.0.0.5 help routers discover and maintain neighbor relationships, which is crucial for OSPF operation.

Conclusion
In summary, the correct multicast address used by the OSPF Hello protocol is 224.0.0.5. This address facilitates efficient communication among OSPF routers, supporting optimal routing decisions in IP networks. Understanding this aspect of OSPF is vital for network engineers and those involved in network design and management.
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