300-415 Question 251
Select 3A company has deployed Cisco SD-WAN across its branch locations. The network administrator is tasked with configuring QoS policies on the WAN Edge routers to prioritize critical application traffic, such as voice, and limit the bandwidth used by non-critical applications, such as file downloads. Which of the following configurations are required to achieve this?
- A
Define application-aware routing policies to identify and prioritize traffic based on application types.
- B
Configure a traffic policy with class-maps to classify traffic based on DSCP values or application signatures.
- C
Apply the QoS policy to the appropriate VPN interface on the WAN Edge router.
- D
Enable rate limiting at the transport interface level to restrict traffic for non-critical applications.
- E
Use TLOC extension to ensure traffic is rerouted in case of a link failure.
Show answer and explanation
Correct answers: B, C, D
Explanation
To configure QoS treatment on WAN Edge routers, the administrator must classify traffic using class-maps, apply QoS policies to the correct VPN interface, and implement rate limiting to manage bandwidth for non-critical traffic. Application-aware routing and TLOC extension are unrelated to QoS policy configuration in this scenario.
- A. Incorrect.
Application-aware routing policies are used to direct traffic based on application performance metrics but do not directly configure QoS treatment.
- B. Correct.
Class-maps are essential to identify and classify traffic so that QoS policies can prioritize or limit bandwidth for specific traffic types.
- C. Correct.
QoS policies must be applied to the appropriate VPN interface on the WAN Edge router for them to take effect.
- D. Correct.
Rate limiting is critical for restricting bandwidth usage of non-critical applications, ensuring that critical traffic like voice remains unaffected.
- E. Incorrect.
TLOC extension is used for link redundancy and failover, not for configuring QoS or bandwidth prioritization.