Question

A UC engineer is deploying wireless IP phones on an 802.11 WLAN. Voice calls over Wi-Fi experience intermittent delay and jitter even though the wired core already trusts DSCP end-to-end. Which statement correctly describes a QoS consideration unique to carrying signaling and media across the wireless portion of the network?

Accepted Answer

The AP maps DSCP values to Wi-Fi Multimedia (WMM) access categories using the UP (User Priority) field, and voice media (EF/DSCP 46) should map to the Voice (AC_VO) access category for prioritized airtime access.

Answer

802.11 WLANs use the same 8-queue egress scheduling as wired switch ports, so DSCP 46 is honored directly without any translation to a wireless priority marking.

Answer

Signaling and media are placed into a single best-effort queue on the AP because 802.11 has no mechanism to differentiate traffic classes.

Answer

Wireless QoS is enforced solely by the WLAN controller setting the CoS (802.1p) value in the radio frame, independent of any DSCP-to-UP mapping at the AP.