300-415 Question 272
Single answerAn enterprise has implemented Cisco SD-WAN in its network and plans to use per-tunnel and adaptive QoS to optimize application performance. The network administrator notices that voice traffic is being impacted during congestion. Which configuration step can ensure that voice traffic is prioritized during congestion while utilizing adaptive QoS?
- A
Define a QoS map and apply it to the TLOC extensions.
- B
Configure an application-aware routing policy to prioritize voice traffic under high latency conditions.
- C
Enable DSCP marking for voice traffic in the data policy.
- D
Specify a traffic profile with EF (Expedited Forwarding) marking for voice in the QoS policy.
Show answer and explanation
Correct answer: D
Explanation
Adaptive QoS in Cisco SD-WAN dynamically adjusts traffic prioritization based on real-time conditions. Voice traffic, being highly sensitive to latency and jitter, requires EF marking to ensure it is prioritized during congestion. By specifying a traffic profile with EF marking in the QoS policy, the network can guarantee that voice traffic receives the necessary resources, aligning with the principles of per-tunnel and adaptive QoS.
- A. Incorrect.
Defining a QoS map and applying it to TLOC extensions does not directly address prioritization of voice traffic within the context of adaptive QoS. It is used for traffic prioritization between TLOCs.
- B. Incorrect.
While application-aware routing allows traffic to be forwarded based on performance metrics, it does not guarantee prioritization of voice traffic during congestion without a proper QoS policy.
- C. Incorrect.
DSCP marking helps classify traffic but does not inherently ensure prioritization during congestion without being tied to a specific QoS policy.
- D. Correct.
Specifying a traffic profile with EF marking ensures that voice traffic is treated with high priority and low latency, which is critical for per-tunnel and adaptive QoS configurations during congestion.