300-415 Question 274
Single answerAn enterprise has deployed Cisco SD-WAN and configured multiple tunnels between branch sites and the data center. The network team wants to ensure that voice traffic is prioritized and seamlessly adapts to changes in network conditions, such as latency or packet loss. Which configuration approach would best meet this requirement?
- A
Configure per-tunnel QoS policies with priority queuing for voice traffic.
- B
Enable application-aware routing and configure SLA policies for voice traffic.
- C
Configure static QoS policies on all WAN edge routers.
- D
Deploy centralized QoS policies without considering real-time network conditions.
Show answer and explanation
Correct answer: B
Explanation
The correct answer is to enable application-aware routing with SLA policies for voice traffic. This approach leverages Cisco SD-WAN's ability to monitor real-time network conditions such as latency, packet loss, and jitter. It ensures that voice traffic is dynamically routed through the best-performing tunnel, maintaining high-quality communication even under changing conditions. While other approaches like per-tunnel QoS or static policies provide some level of prioritization, they lack the adaptability needed for optimal performance in an SD-WAN environment.
- A. Incorrect.
Per-tunnel QoS with priority queuing can prioritize traffic within a tunnel, but it does not adapt to changing network conditions across multiple paths.
- B. Correct.
Application-aware routing with SLA policies allows the SD-WAN solution to dynamically select the best-performing tunnel for voice traffic based on real-time metrics such as latency, loss, and jitter, making it the most effective solution.
- C. Incorrect.
Static QoS policies do not adapt to network conditions and cannot dynamically optimize traffic paths, which is a key requirement for voice traffic.
- D. Incorrect.
Centralized QoS policies alone cannot account for real-time network conditions and do not ensure the adaptability required for voice traffic in SD-WAN.