1) These terms are used differently in different documentations. Usually they refer to same thing. Some also use "neighbor adjacencies". The official terms that are actually different is "peering relationship" and adjacency. Peering relationship is the process that starts with 2-way connectivity and ends with synchronizing route databases. Peering relationship is the essential process for OSPF routers to become adjacent.
2) For a Link State Update packet sent, router receives an Acknowledgement packet. That makes the process reliable just like the TCP protocol.
3) In a broadcast segment (Ethernet for eaxample), OSPF PDUs that form, keep adjecencies and contain route updates are sent to well known multicast addresses 22.214.171.124 and 126.96.36.199 . But in a non-broadcast segment (Point to point for example), multicast does not exist. You use "unicast" between peers, using the neighbor command.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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