HPE7-A01 practice question 3 of 25

What are the requirements to ensure that WMM is working effectively'? (Select two)

Full set: 117 questions

Answer options

A: The APs and the controller are Wi-Fi CERTIFIED for WMM which is enabled Correct answer

B: All APs need to be from the AP-5xx series and AP-6xx series which are Wi-Fi CERTIFIED 6.

C: The Client must be Wi-Fi CERTIFIED for WMM and configured for WMM marking. Correct answer

D: The Aruba AOS10 APs installed have to be converted to controlled mode

E: The AP needs to be connected via a tagged VLAN to the wired port

Correct Answer:

A. The APs and the controller are Wi-Fi CERTIFIED for WMM which is enabled; C. The Client must be Wi-Fi CERTIFIED for WMM and configured for WMM marking.

Explanation

Wi-Fi Multimedia (WMM) is a Wi-Fi Alliance certification program based on the IEEE 802.11e standard, designed to provide Quality of Service (QoS) on wireless networks. For WMM to function effectively, it requires end-to-end support. This means both the network infrastructure, specifically the Access Point (AP), and the client device must be WMM-certified and have the feature enabled. The client's operating system or application must also mark traffic into the appropriate WMM Access Categories (Voice, Video, Best Effort, Background). If either the AP or the client does not support WMM, the connection will revert to standard, non-prioritized data transmission.

Why Incorrect

B. WMM predates Wi-Fi 6 (AP-5xx/6xx series). Many older Wi-Fi certified APs (e.g., Wi-Fi 4/5) also support WMM.
D. WMM is a fundamental Wi-Fi standard and its operation is independent of whether an Aruba AP is in controlled or standalone (IAP) mode.
E. VLAN tagging is for mapping wireless QoS to the wired network (802.1p), not a prerequisite for WMM to function over the air between the AP and client.

References

1. Wi-Fi Alliance. (2016). Wi-Fi CERTIFIED WMM®: Technology Overview.

Reference: Page 1

Section "Introduction". The document states

"Both the access point and the client device must be Wi-Fi CERTIFIED for WMM for the feature to work." This directly supports answers A and C.

2. Aruba. (2022). ArubaOS 10.4 User Guide.

Reference: Chapter "Configuring WLAN SSID Settings"

Section "Wi-Fi Multimedia (WMM)". The guide explains

"WMM is a Wi-Fi Alliance certification that provides basic QoS features to IEEE 802.11 networks." This confirms that the infrastructure (AP/controller) must support this certification

backing answer A.

3. Mangold

Choi

Hiertz

G. R.

Klein

& Walke

B. (2003). Analysis of IEEE 802.11e for QoS support in wireless LANs. IEEE Wireless Communications

10(6)

40-50.

Reference: Section III

"THE IEEE 802.11e MAC PROTOCOL". This academic paper explains that the underlying mechanism

Enhanced Distributed Channel Access (EDCA)

requires a "QoS-aware AP" and "QoS-aware stations (STAs)" to negotiate QoS parameters. This supports the requirement for both AP (A) and client (C) participation.

DOI: https://doi.org/10.1109/MWC.2003.1265841

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