Final answer:
The OSPF neighbor states in the correct order are 2-Way, Exstart, Exchange, Loading, Full, Init, Down.
Step-by-step explanation:
The correct order of OSPF neighbor states is: 2-Way, Exstart, Exchange, Loading, Full, Init, Down.
During the OSPF adjacency formation process, routers go through various states. Initially, they are in the Init state, where they start the process of establishing adjacency. Then, they transition to the 2-Way state, where they exchange information with their neighbors. Next, they enter the Exstart state, where they determine the initial sequence numbers for database synchronization. After that, they move to the Exchange state, where they exchange link-state information. Then, they enter the Loading state, where they request and receive specific link-state information. Finally, they reach the Full state, where they have established full adjacency with their neighbors. If a neighbor relationship fails, they enter the Down state.