300-425 Question 52
Select 3A network administrator is tasked with implementing QoS for a Cisco wireless network to ensure that voice traffic receives priority over other types of traffic. Which of the following configurations should the administrator apply to achieve this goal?
- A
Configure a QoS profile with Platinum (Voice) level on the WLAN.
- B
Enable WMM (Wi-Fi Multimedia) on the wireless network.
- C
Assign voice traffic to a lower DSCP (Differentiated Services Code Point) value for best effort delivery.
- D
Map voice traffic to the AC_VI (Access Category: Video) queue instead of AC_VO (Access Category: Voice).
- E
Apply traffic shaping to limit bandwidth for all data traffic except voice.
Show answer and explanation
Correct answers: A, B, E
Explanation
To implement QoS for wireless clients, it is essential to prioritize voice traffic, as it is sensitive to latency and jitter. Configuring a QoS profile with Platinum level, enabling WMM, and applying traffic shaping for non-voice traffic are effective methods to achieve this. Assigning lower DSCP values or misclassifying voice traffic would undermine QoS objectives and degrade voice performance.
- A. Correct.
Correct. Configuring a QoS profile with Platinum (Voice) ensures that voice traffic is prioritized over other types of traffic on the WLAN.
- B. Correct.
Correct. Enabling WMM allows the wireless network to prioritize traffic based on access categories, such as voice, video, best effort, and background.
- C. Incorrect.
Incorrect. Assigning voice traffic to a lower DSCP value contradicts QoS principles, as higher DSCP values indicate higher priority.
- D. Incorrect.
Incorrect. Mapping voice traffic to the AC_VI (Video) queue instead of AC_VO (Voice) would result in suboptimal prioritization for voice traffic.
- E. Correct.
Correct. Applying traffic shaping to limit bandwidth for non-voice data ensures that sufficient resources are available for voice traffic.