Which type of OSPF packet is used by a router to discover neighbor routers and establish neighbor adjacency?
- link-state request
- hello
- database description
- link-state update
| Explanation & Hint:
In OSPF (Open Shortest Path First), the Hello packet is used by routers to discover neighbor routers on OSPF-enabled interfaces and to establish and maintain neighbor adjacencies. Hello packets are sent periodically on all OSPF interfaces, including virtual links, to establish and test the link to neighbors. If a router stops receiving Hello packets from a neighbor, after a specified interval, the neighbor relationship is considered down. |