300-415 Question 249
Select 3A company has deployed Cisco SD-WAN and wants to ensure that VoIP traffic is prioritized over file transfer traffic on their WAN Edge routers. As a network engineer, you have been tasked with configuring QoS policies to achieve this. Which steps must you take to configure QoS treatment on WAN Edge routers for this requirement?
- A
Create a QoS map and classify VoIP traffic using DSCP markings.
- B
Apply the QoS policy to the VPN interface template on the WAN Edge router.
- C
Configure the control policy to prioritize VoIP traffic in the SD-WAN overlay network.
- D
Create a policer to limit bandwidth for file transfer traffic and apply it to the interface.
- E
Enable application-aware routing to dynamically prioritize VoIP traffic.
Show answer and explanation
Correct answers: A, B, D
Explanation
To configure QoS treatment on WAN Edge routers in Cisco SD-WAN, you must define a QoS map to classify and prioritize traffic, apply the QoS policy to the appropriate interface, and optionally use policers to limit bandwidth for lower-priority traffic. These steps ensure VoIP traffic is prioritized while managing congestion effectively. Control policies and application-aware routing are not directly related to configuring QoS treatment.
- A. Correct.
Correct: Creating a QoS map and classifying VoIP traffic using DSCP markings helps identify and differentiate VoIP traffic from other types of traffic.
- B. Correct.
Correct: Applying the QoS policy to the VPN interface ensures that the policy is enforced on the WAN Edge router's traffic.
- C. Incorrect.
Incorrect: Control policies are used for routing decisions and do not directly prioritize traffic based on QoS requirements.
- D. Correct.
Correct: A policer can be used to limit bandwidth for lower-priority traffic such as file transfers, ensuring that VoIP traffic is not affected by congestion.
- E. Incorrect.
Incorrect: Application-aware routing is used for path selection based on performance metrics and does not directly configure QoS treatment on WAN Edge routers.