When an OSPF router receives a Hello packet containing its own router ID, what is the resulting neighbor state?

When an OSPF router receives a Hello packet that includes its own router ID, it indicates that the neighbor is acknowledging its existence on the network, thereby establishing bidirectional communication. This situation leads to the neighbor entering the "2-way" state.

In the OSPF protocol, the "2-way" state signifies that both routers recognize each other as neighbors and can communicate effectively. This is a crucial step in the OSPF adjacency process because it allows for the establishment of a fully functional OSPF relationship between the routers.

The other states mentioned do not apply in this context. The "Init" state occurs when a router receives a Hello packet but does not see its own router ID; "Exstart" is when routers start to negotiate the master and slave relationship for database exchange, while "Loading" is involved in the actual transfer of database information after the adjacency is established. Hence, the correct answer reflects the state that acknowledges both routers’ identities and readiness to establish a relationship.