When will an OSPF-enabled router transition from the Down state to the Init state?

An OSPF-enabled router transitions from the Down state to the Init state when it receives a Hello packet from a neighbor router. This is a fundamental process in OSPF (Open Shortest Path First) for neighbor discovery and adjacency formation.

When an OSPF router starts up or becomes aware of a potential neighbor, it begins in the Down state, indicating that there are no known neighbors. Upon receiving a Hello packet from a neighboring router, which contains critical information about the sending router (such as its router ID and OSPF parameters), the receiving router can transition to the Init state. This state indicates that at least one Hello packet has been received, but full adjacency has not yet been established.

This transition is crucial in the OSPF process as it allows routers to begin the process of learning about the network topology and ensuring that all routers on the same network segment can communicate effectively. Each state in OSPF is part of the larger neighbor relationship establishment process, and understanding these transitions is key to managing OSPF operations effectively.

Other options, while they describe scenarios that involve OSPF operations, do not accurately pinpoint when the transition from Down to Init occurs. The sending of a Hello packet or rebooting a