300-415 Question 248
Select 3A network administrator is tasked with configuring QoS on a Cisco SD-WAN network to ensure that VoIP traffic is prioritized over other traffic on a WAN Edge router. The administrator needs to classify VoIP traffic based on DSCP markings and allocate a minimum guaranteed bandwidth. Which of the following steps should the administrator perform to achieve this?
- A
Create a QoS map to classify traffic based on DSCP markings.
- B
Define a policer to limit VoIP traffic to a maximum bandwidth.
- C
Configure a queuing policy to allocate minimum guaranteed bandwidth for VoIP traffic.
- D
Apply the QoS policy to the WAN interface.
- E
Enable NetFlow on the WAN Edge router to monitor traffic patterns.
Show answer and explanation
Correct answers: A, C, D
Explanation
To configure QoS treatment for VoIP traffic on a Cisco SD-WAN WAN Edge router, the administrator must classify the traffic (e.g., using DSCP markings), allocate a minimum guaranteed bandwidth via a queuing policy, and apply the QoS policy to the appropriate interface. These steps ensure that VoIP traffic is prioritized and meets performance requirements. Using a policer or enabling NetFlow does not fulfill the requirements of this scenario.
- A. Correct.
Correct. A QoS map classifies traffic, such as VoIP, based on specific criteria like DSCP markings, which is essential for prioritizing traffic.
- B. Incorrect.
Incorrect. A policer limits traffic bandwidth, which is not suitable for VoIP as it requires prioritization and guaranteed bandwidth rather than restriction.
- C. Correct.
Correct. A queuing policy allows you to allocate a minimum guaranteed bandwidth for VoIP traffic, ensuring it gets the necessary resources.
- D. Correct.
Correct. The QoS policy must be applied to the WAN interface for it to take effect on traffic leaving or entering the router.
- E. Incorrect.
Incorrect. While NetFlow provides visibility into traffic patterns, it does not configure QoS or prioritize traffic.