300-415 Question 250
Select 3You are tasked with configuring QoS on a Cisco SD-WAN Edge router to prioritize voice traffic over less critical data traffic. Which of the following steps must be performed to ensure that voice traffic receives higher priority across the WAN link?
- A
Define a QoS policy within the vManage policy framework and apply it to the appropriate VPNs.
- B
Configure a DSCP-based classification and mapping in the local QoS map on the WAN Edge router.
- C
Apply a traffic policing rule to limit the voice traffic bandwidth to 50% of the WAN link capacity.
- D
Associate the QoS policy with the outbound interface on the WAN Edge router.
- E
Enable application-aware routing for the voice traffic to dynamically adjust to changing network conditions.
Show answer and explanation
Correct answers: A, B, D
Explanation
To configure QoS treatment on WAN Edge routers for prioritizing voice traffic, you must define a QoS policy in vManage, create DSCP-based classification to identify and prioritize voice traffic, and associate the policy with the outbound interface. These steps ensure that voice traffic receives the necessary priority over other types of traffic. Traffic policing and application-aware routing, while useful in different contexts, are not primary steps for QoS prioritization in this scenario.
- A. Correct.
Defining a QoS policy within the vManage policy framework is a necessary step to classify and prioritize traffic on an SD-WAN deployment. This allows you to identify and treat voice traffic appropriately.
- B. Correct.
Configuring DSCP-based classification and mapping ensures that voice traffic is recognized and assigned the appropriate priority for QoS treatment.
- C. Incorrect.
Traffic policing is generally not used to prioritize voice traffic, as it could lead to packet drops, negatively affecting voice quality. Instead, queuing mechanisms are typically used.
- D. Correct.
Associating the QoS policy with the outbound interface is necessary to enforce the policy and prioritize traffic as it leaves the WAN Edge router.
- E. Incorrect.
While application-aware routing can improve voice traffic performance by selecting optimal paths, it is not directly related to QoS prioritization configurations on the WAN Edge router.