HPE Aruba Certified Mobility Associate (ACMA) — Question 44

A customer needs a networking solution that supports their Microsoft Skype for Business Unified Communications (UC) solution. The architect discovers that user wireless devices are Wi-Fi Multimedia (WMM) capable. Windows policies assign voice traffic DSCP 46 and video traffic DSCP 34.
Which potential issue should the architect explain to the customer about the default QoS settings?

Answer options

• A. The DSCP values place both voice and video traffic in the video WMM queue, so voice does not receive the prioritization that is should.
• B. The Aruba APs and controllers use different prioritization mechanisms from WMM, so they will not accept high priority traffic from the wireless devices.
• C. DSCP is incompatible with WMM. The Aruba APs and controllers instead use 802.1p to mark traffic to and from wireless devices.
• D. The DSCP for wireless client traffic is concealed within the GRE packet on the path from the AP to the controller, and does not take effect.

Correct answer: A

Explanation

The correct answer is A because the DSCP values assigned to voice and video traffic result in both types being placed in the video WMM queue, leading to voice traffic not being prioritized appropriately. Options B, C, and D are incorrect as they misrepresent how QoS operates in this context; specifically, WMM can coexist with DSCP, and traffic marking is not hidden in GRE packets in this scenario.