Câu 55: 400-201: CCIE SP Written v4.1

Refer to the exhibit. R1 and R5 routers are not directly connected. Loopback 0 is configured as LDP router id for both R1 and R5 routers. Loopback 0 IPv4 addresses are reachable between R1 and R5 routers. The LDP session between R1 and R5 is not established. There is no access-list applied in any routers in the path between R1 and R5. Which is the reason the LDP session is not working?

1. A. LDP authentication are missing in both R1 and R5 routers.
2. B. Targeted LDP works only for directly connected LDP neighbors.
3. C. R5 is not configured to accept targeted LDP sessions. — đáp án hiện tại
4. D. It is necessary to create a GRE tunnel between R1 and R5 in order to targeted LDP session to work for a non directly connected LDP neighbors.