HPE Campus Access Mobility Expert (HPE7-A07)

By HP · Question Mode

QuestionQ54

WLAN

An ACME company employee reported a recent poor-quality VoIP call while moving through their office environment. HPE Aruba Networking Central reported a fair UCC score for the call, whereas your VoIP engineer’s systems reported a MOS of 2.3. The VoIP devices operate in the 5 GHz frequency band.

What are the possible contributing factors?

Choose two
Explanation

Incorrect 802.11e/WMM QoS design can fail to prioritize voice frames and meet delay-sensitive voice requirements. Localized RF interference can increase retransmissions, packet loss, jitter, and latency, degrading call quality. HPE Aruba Networking documents define WMM as an IEEE 802.11e-based QoS mechanism with a voice access category and state that voice traffic is delay-sensitive; they also document RF management as measuring interference and selecting channel and power settings. MOS is an end-to-end metric, whereas the UCC score represents WLAN-side call quality, so the two measurements need not be identical.

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