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?
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 deletionis not a direct function of Hello packets. Neighbor deletion results indirectly from missed Hello packets.
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