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In OSPF, which protocol is used to discover neighbour routers automatically?

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In OSPF, which protocol is used to discover neighbour routers automatically?

(a) Link state protocol

(b) Error-correction protocol

(c) Routing information protocol

(d) Hello protocol

The question was posed to me in an interview for job.

I want to ask this question from OSPF in section Network Layer of Computer Network

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The correct answer is (d) Hello protocol

The explanation is: Hello protocol is used to discover neighboring routers automatically. It makes sure that the communication between neighbors is bidirectional. It’s similar to the real world moral construct of saying “Hello” to initialize the communication.

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