300-415 Question 123
Single answerA branch office in your SD-WAN network has two ISP circuits connected to two different WAN Edge routers. Due to limited physical connections, you need to ensure that both circuits can terminate traffic on a single WAN Edge router while maintaining redundancy. Which feature should be implemented to achieve this functionality?
- A
TLOC-extension
- B
BFD (Bidirectional Forwarding Detection)
- C
Dynamic NAT
- D
App-aware routing
Show answer and explanation
Correct answer: A
Explanation
TLOC-extension is a feature in Cisco SD-WAN that allows a WAN Edge router to extend its transport locators (TLOCs) to another WAN Edge router. This is particularly useful in scenarios where you need to terminate multiple circuits on a single router while maintaining redundancy and efficient traffic handling. None of the other options provide this specific functionality.
- A. Correct.
TLOC-extension allows one WAN Edge router to terminate circuits from a second WAN Edge router, enabling redundancy and efficient use of available circuits. This is the correct answer.
- B. Incorrect.
BFD is used for fast failure detection between SD-WAN endpoints. While it enhances reliability, it does not address the need to terminate multiple circuits on a single WAN Edge router.
- C. Incorrect.
Dynamic NAT translates private IP addresses to public IPs for internet access but is unrelated to terminating circuits or enabling redundancy through TLOC-extension.
- D. Incorrect.
App-aware routing dynamically selects paths based on application performance requirements, but it does not provide the capability to terminate circuits from multiple routers on a single router.