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Neighbor state changes (database exchange) Exchange start (exstart): The exstart state is the first step of adjacency of two routers. Exchange: In the exchange state, a router is sending its link-state database information to the adjacent neighbor. At this state, a router can exchange all OSPF routing protocol packets.
A simple illustration of public-key cryptography, one of the most widely used forms of encryption. In cryptography, encryption (more specifically, encoding) is the process of transforming information in a way that, ideally, only authorized parties can decode.