Refer to the exhibit. R2 and R3 are running EBGP and are learning Network A and Network B. R2 and R3 are also running IBGP to exchange Network A and Network B. OSPF is IGP. R2 and R3 are advertising default routes. R1 and R4 can send and receive traffic from Network A and Network B respectively. However, Network A cannot send traffic to Network B.
How can you solve this problem?
A . create a tunnel between R2 and R3
B . create a tunnel between R2 and R4
C . create static default routes pointing from R1 and R4 to R2 and R3, respectively
D . convert R3 and R2 to ABRs so that R1 and R4 can choose the closest ABR to exit the network
Answer: A