300-425 Question 54
Select 3A university is deploying a new Wi-Fi network to support high-density lecture halls where students frequently stream video content, attend live online lectures, and submit assignments. To ensure a seamless user experience, the network administrator is tasked with implementing QoS for wireless clients. What steps should the administrator take to prioritize latency-sensitive applications such as VoIP and video streaming while maintaining a balanced network performance?
- A
Configure WMM (Wi-Fi Multimedia) on wireless access points to enable prioritization of traffic classes.
- B
Apply a DSCP-to-UP mapping to ensure correct QoS markings are preserved between wired and wireless networks.
- C
Disable WMM to avoid performance issues caused by traffic prioritization.
- D
Implement QoS profiles that assign lower priority to bulk data transfer applications such as file downloads.
- E
Enable 802.11r fast roaming to improve QoS for latency-sensitive applications.
Show answer and explanation
Correct answers: A, B, D
Explanation
To implement QoS for wireless clients effectively, it is critical to enable WMM to prioritize traffic classes, map DSCP-to-UP values to maintain QoS consistency across wired and wireless networks, and deprioritize bulk data transfers to ensure bandwidth availability for real-time applications. Disabling WMM would negate QoS benefits, and while fast roaming improves mobility, it is not a QoS mechanism.
- A. Correct.
Enabling WMM is essential for prioritizing traffic classes such as voice, video, best effort, and background traffic in a wireless network.
- B. Correct.
Mapping DSCP (Differentiated Services Code Point) values to UP (User Priority) ensures that QoS markings are preserved when traffic transitions from the wired to wireless network.
- C. Incorrect.
Disabling WMM would prevent prioritization of traffic, leading to suboptimal performance for latency-sensitive applications.
- D. Correct.
Creating QoS profiles that deprioritize bulk data transfers (e.g., file downloads) ensures that bandwidth is reserved for critical applications like VoIP and video streaming.
- E. Incorrect.
While 802.11r fast roaming improves roaming performance in a Wi-Fi network, it is not directly related to traffic prioritization for QoS.