H12-821_V1.0 Exam Dumps | On an OSPF network, there are multiple types of packets, each with a different function. Which of the

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Question 31/140

On an OSPF network, there are multiple types of packets, each with a different function. Which of the following are the main functions of Hello packets?

A. Neighbor relationship maintenance

B. Neighbor discovery

C. Neighbor deletion

D. Neighbor relationship establishment

Correct Answer: A,B,D

Hello packets are the most basic and essential type of OSPF packets used for the following purposes:
* Neighbor discovery - Routers use Hello packets to discover other OSPF routers on the same link.
* Neighbor relationship establishment - When two routers exchange matching Hello packets, they move from the "Init" state to "2-Way" and further into adjacency states.
* Neighbor relationship maintenance - Hello packets are sent periodically to ensure that neighbors are still reachable. If Hello packets are missed within the dead interval, the neighbor is considered down.
Neighbor deletion is not a direct function of Hello packets. Neighbor deletion results indirectly from missed Hello packets.
Reference:Huawei HCIP-Datacom-Core Technology Study Guide(Chapter: OSPF Fundamentals - Section:
OSPF Packet Types)

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