What is causing the problem?
A. There is a Layer 2 issue; an encapsulation mismatch on serial links.
B. There is an area ID mismatch.
C. The R3 router ID is configured on R4.
D. There is an OSPF hello and dead interval mismatch.
Answer:B
What is causing the problem?
A. There is a Layer 2 issue; an encapsulation mismatch on serial links. B. There is an area ID mismatch. C. The R3 router ID is configured on R4. D. There is an OSPF hello and dead interval mismatch.
Explanation: Explanation/Reference: