An OSPF neighbor adjacency is not formed between R3 in the main office and R4 the Branch1 office. What is causing the problem?
A. The R3 router ID is configured on R4.
B. There is a Layer 2 issue; an encapsulation mismatch on serial links.
C. There is an area ID mismatch.
D. There is an OSPF hello and dead interval mismatch.
Answer:C
An OSPF neighbor adjacency is not formed between R3 in the main office and R4 the Branch1 office. What is causing the problem?
A. The R3 router ID is configured on R4. B. There is a Layer 2 issue; an encapsulation mismatch on serial links. C. There is an area ID mismatch. D. There is an OSPF hello and dead interval mismatch.
Explanation: A show running-config command on R3 and R4 shows that R4 is incorrectly configured for area 2: