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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Chapter 9

A1: From the perspective of an OSPF router, a neighbor is another OSPF router that is attached to one of the first router's directly connected links.
A2: An OSPF adjacency is a conceptual link to a neighbor over which LSAs can be sent.
A3: The five OSPF packet types, and their purposes, are:
  • Hellos, which are used to discover neighbors, and to establish and maintain adjacencies

  • Updates, which are used to send LSAs between neighbors

  • Database Description packets, which a router uses to describe its link state database to a neighbor during database synchronization

  • Link State Requests, which a router uses to request one or more LSAs from a neighbor's link state database

  • Link State Acknowledgments, used to ensure reliable delivery of LSAs

A4: ...

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