300-415 Question 192
Single answerAn organization has deployed Cisco SD-WAN in their environment and wants to ensure that specific critical applications like video conferencing use the most optimal path with the lowest latency, while less critical traffic like file backups can take a less efficient path. Which configuration step is necessary to achieve this using application-aware routing?
- A
Define an SLA class with thresholds for latency, jitter, and packet loss, and associate it with the desired application traffic.
- B
Enable QoS policies on the SD-WAN data plane to prioritize critical application traffic over less critical traffic.
- C
Configure a centralized control policy to influence the routing of critical traffic to specific data centers.
- D
Enable DPI (Deep Packet Inspection) on the WAN Edge devices to classify applications dynamically.
Show answer and explanation
Correct answer: A
Explanation
Application-aware routing in Cisco SD-WAN relies on defining SLA classes to specify acceptable thresholds for latency, jitter, and packet loss for critical applications. Once the SLA class is configured, the SD-WAN fabric dynamically monitors all available paths and routes traffic over the most optimal path that meets the SLA requirements. This ensures that critical applications receive the necessary network performance while less critical applications can use alternate paths.
- A. Correct.
Defining an SLA class with thresholds for latency, jitter, and packet loss is a fundamental step in configuring application-aware routing. This allows the SD-WAN fabric to monitor paths and ensure the application traffic adheres to the defined SLA.
- B. Incorrect.
Enabling QoS policies is related to traffic prioritization within a link but does not directly select paths based on application performance metrics, which is the goal of application-aware routing.
- C. Incorrect.
Configuring a centralized control policy is used to enforce routing decisions at a broader level but does not dynamically monitor and adjust paths based on application SLAs.
- D. Incorrect.
Enabling DPI (Deep Packet Inspection) is a feature that helps classify applications, but it does not handle path selection or SLA enforcement, which is critical for application-aware routing.