300-430 Question 43
Single answerA company is deploying a wireless network to support voice-over-Wi-Fi (VoWiFi) applications. During the configuration of QoS settings, the administrator is tasked with ensuring that voice traffic is prioritized over other types of traffic, such as web browsing or file downloads. Which QoS configuration should the administrator implement to achieve this?
- A
Set the WMM parameter for voice traffic to the AC_VO category and ensure it has the highest priority.
- B
Disable WMM on the wireless network to allow all traffic types to be treated equally.
- C
Map the voice traffic DSCP markings to the AC_BE (Best Effort) queue for balanced traffic handling.
- D
Configure a lower priority for voice traffic compared to video traffic to ensure video quality is preserved.
Show answer and explanation
Correct answer: A
Explanation
Voice-over-Wi-Fi (VoWiFi) requires low latency, low jitter, and high priority to function effectively. Wi-Fi Multimedia (WMM) provides QoS mechanisms for wireless networks, enabling traffic prioritization. Setting voice traffic to AC_VO ensures it is prioritized over other categories, meeting the requirements for high-quality voice communication.
- A. Correct.
Correct. WMM (Wi-Fi Multimedia) is used to prioritize traffic on a wireless network. Setting the WMM parameter for voice traffic to AC_VO (Access Category for Voice) ensures it receives the highest priority, which is essential for latency-sensitive applications like VoWiFi.
- B. Incorrect.
Incorrect. Disabling WMM would prevent traffic prioritization, leading to potential delays or packet loss for latency-sensitive traffic like voice.
- C. Incorrect.
Incorrect. Mapping voice traffic to AC_BE (Best Effort) would treat it as regular traffic with no prioritization, which is unsuitable for applications requiring low latency and jitter.
- D. Incorrect.
Incorrect. Configuring a lower priority for voice traffic compared to video traffic would result in poor performance for voice applications, as voice typically requires stricter QoS parameters than video.