Which of the following conditions will prevent an OSPF adjacency from reaching the full state? Choose three answers.
Which of the following conditions will prevent an OSPF adjacency from reaching the full state? Choose three answers.
An MTU mismatch can prevent OSPF routers from forming an adjacency because OSPF expects the MTU to be identical on both sides of a link. An incorrect subnet mask will prevent OSPF routers from becoming neighbors as they must be on the same subnet to form a neighbor relationship. Similarly, having different Area IDs will prevent OSPF adjacency because OSPF routers need to have matching Area IDs to form an adjacency.
A is correct