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Which multicast address does the OSPF Hello protocol use?

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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

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This key question is from OSPF Configuration topic in portion Network Layer of Computer Network

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The correct answer is (a) 224.0.0.5

The explanation: Hello protocol is used to discover neighboring routers automatically. It makes sure that the communication between neighbors is bidirectional. The multicast address that the OSPF Hello protocol uses is 224.0.0.5.

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