300-415 Question 120
Single answerAn enterprise has deployed Cisco SD-WAN at multiple branch sites. At one branch, the primary WAN circuit is facing intermittent issues, so the engineer decides to configure TLOC-extension using a secondary WAN router. Which statement about TLOC-extension is correct?
- A
TLOC-extension allows the primary router to utilize the secondary router's transport links while still maintaining its own control connections.
- B
TLOC-extension requires both routers to share the same system IP address to correctly establish data plane traffic forwarding.
- C
TLOC-extension is only supported if both routers are connected to the same transport provider.
- D
TLOC-extension eliminates the need for NAT traversal when communicating with remote sites.
Show answer and explanation
Correct answer: A
Explanation
TLOC-extension is a Cisco SD-WAN feature that allows one router to share its transport circuits with another router, providing enhanced resiliency and redundancy in case of link failure. The primary router can still maintain its own control connections while leveraging the transport circuits of the secondary router. This feature does not require the routers to share system IPs, depend on the same transport provider, or eliminate NAT traversal requirements.
- A. Correct.
Correct. TLOC-extension allows a WAN edge router to utilize the transport circuits of another WAN edge router, enabling redundancy and resiliency while maintaining its own control connections.
- B. Incorrect.
Incorrect. TLOC-extension does not require sharing the same system IP address. Each router retains its unique system IP.
- C. Incorrect.
Incorrect. TLOC-extension is independent of the transport provider, and it can be used across different transport types.
- D. Incorrect.
Incorrect. TLOC-extension does not eliminate the requirement for NAT traversal; NAT traversal may still be needed depending on the transport and network design.