Which of the following description of OSPF neighbor relationship and adjacency relationship is correct?

Which of the following description of OSPF neighbor relationship and adjacency relationship is correct?
A .  The adjacency relationship is maintained by OSPF DD packets
B . OSPF routers must establish an adjacency before exchanging Hello packets
C .  The neighbor relationship is selected from the adjacency relationship and formed to exchange routing information
D .  Not all neighbor relationships can be adjacencies

View Answer

Answer: D