Which configuration should be done in order to improve the performance of the Cisco Unified Wireless IP Phone 7921G in a WLAN infrastructure?（）

单项选择题WhatistheCiscorecommendedsettingfortheCiscoUnifiedWirelessNetworkWLCVoiceCall AdmissionControlMaxRFBandwidthtosupporttheCiscoUnifiedWirelessIPPhone7921G?（）

A.nominally 30 percent to best align with Cisco Unified Communications System recommendations
B.100 percent to ensure that the VoWLAN calls can use all the available bandwidth, if needed
C.system default of 75 percent
D.40 to 60 percent
E.voice CAC should be left disabled unless wired QoS is configured

多项选择题WhichthreeWLCitemsarerequiredtoproperlyenablequeuingwithTSPECforvoicetraffic?（）

A.configure WLAN setting to enable WMM
B.configure WLAN Aironet information elements enabled
C.configure global 802.11b/g or 802.11a，or both，voice CAC
D.configure WLAN QoS Platinum
E.configure DTIM = 2

单项选择题ForwhichWMMqueueisU-APSDmostbeneficial?（）

A.on any of the queues
B.AC_VO
C.AC_VI
D.the strict priority queue

多项选择题WhichthreearebenefitsofU-APSD?（）

A.synchronization of the transmission and reception of voice frames
B.bandwidth reservation
C.optimized power-save mode periods
D.increased call capacity
E.priority bandwidth and polling

单项选择题WhatistheCiscorecommendedEDCFqueuetouseforvoiceTSPEC?（）

A.AC_VI
B.AC_VO
C.AC_BK
D.AC_BE