300-415 Question 273
Single answerA company is using Cisco SD-WAN to manage its branch locations. The network administrator has configured per-tunnel QoS policies to prioritize VoIP traffic over other application traffic. However, some branches are experiencing high congestion, causing VoIP performance issues. How can the administrator leverage adaptive QoS to address this problem?
- A
Configure Application-Aware Routing to dynamically select the best-performing path for VoIP traffic.
- B
Increase the bandwidth allocation for VoIP traffic in the per-tunnel QoS policy.
- C
Enable Forward Error Correction (FEC) for VoIP traffic to improve packet delivery.
- D
Use the SD-WAN policy framework to enable dynamic traffic shaping based on real-time link performance.
Show answer and explanation
Correct answer: A
Explanation
Adaptive QoS in Cisco SD-WAN leverages Application-Aware Routing to automatically adjust traffic paths based on real-time link performance metrics such as loss, latency, and jitter. This helps ensure that VoIP traffic, which is sensitive to these parameters, is routed over the best available link, maintaining optimal performance even during congestion. While other solutions like increasing bandwidth or enabling FEC may assist in certain scenarios, Application-Aware Routing is the most effective solution for resolving the issue described.
- A. Correct.
Application-Aware Routing works in conjunction with adaptive QoS to dynamically select the most optimal path for traffic based on real-time performance metrics such as loss, latency, and jitter. This directly helps resolve performance issues for VoIP traffic.
- B. Incorrect.
Increasing bandwidth allocation in a per-tunnel QoS policy can help in environments with sufficient bandwidth, but it does not address dynamic congestion or real-time link performance changes.
- C. Incorrect.
Enabling Forward Error Correction (FEC) can improve packet delivery, but it does not directly address the need for dynamic path selection or adaptive QoS based on congestion.
- D. Incorrect.
Dynamic traffic shaping can assist in managing link performance, but it is not a feature directly tied to adaptive QoS for resolving congestion issues for specific applications like VoIP.