Which two statements are true about the OSPF adjacency displayed in the exhibit?

Exhibit

Which two statements are true about the OSPF adjacency displayed in the exhibit? (Choose two.)
A . There is a mismatch in the hello interval parameter between routers R1 and R2
B . There is a mismatch in the dead interval parameter between routers R1 and R2.
C . There is a mismatch in the OSPF hold timer parameter between routers R1 and R2.
D . There is a mismatch in the poll interval parameter between routers R1 and R2.

View Answer

Answer: A,B

Explanation:

The hello interval is the time interval between two consecutive hello packets sent by an OSPF router on an interface. The dead interval is the time interval after which a neighbor is declared down if no hello packets are received from it. These parameters must match between two OSPF routers for them to form an adjacency. In the exhibit, router R1 has a hello interval of 10 seconds and a dead interval of 40 seconds, while router R2 has a hello interval of 30 seconds and a dead interval of 120 seconds. This causes a mismatch and prevents them from becoming neighbors23.