Which OSPF state indicates that the router is ready to form a neighbor adjacency?

The state that indicates a router is ready to form a neighbor adjacency in OSPF (Open Shortest Path First) is known as the Full state. When a router reaches the Full state, it signifies that it has successfully exchanged information with its neighbors and formed a complete adjacency. This is essential for OSPF to operate effectively, as it means that both routers have a complete understanding of each other's OSPF routing information.

In this state, both routers have acknowledged each other's Link State Advertisements (LSAs) and have completed the necessary database synchronization. Being in the Full state enables routers to share routing updates efficiently, ensuring that they can properly convey paths and reachability information throughout the OSPF network.

The other states mentioned, while part of the OSPF neighbor state machine, do not indicate the readiness to form a complete adjacency. For instance, the 2-way state is where a router has seen its own router ID in the LSAs received from a neighbor, affirming bidirectional communication but not yet complete adjacency. The Exstart state is involved in the beginning of the database exchange process and signifies preparations to establish the relationship for synchronization, while the Down state indicates that there is no OSPF communication occurring at all, meaning