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OSPF Neighbor States This lesson is an excellent demonstration of how OSPF works between neighboring devices. We begin by exploring all the fields in the Hello Packet and examining them in detail covering the CCNA exam and what you should know as a practicing CCNA. You'll learn where in the sharing process routers become OSPF neighbors and start the database information sharing. We'll also examine what's met by the "Down" state and how that is different from FULL and what takes place during each of these states.