For which quality of service parameter should the WLAN for VoWLAN clients be configured?（）

单项选择题WhenusingsimultaneousvoiceandmulticastonasingleWLANandRFband,whatisthe recommendedDTIMvalueoftheWLANforVoWLANdevices?（）

A.DTIM = 1
B.DTIM = 2
C.DTIM = 3
D.DTIM = 4

单项选择题WhatistheWMMuserpriorityofthepacketsgoingdownstreamtotheclientwhentheclientdoesnot supportTSPECbuttheCiscoWLChasACMenabledandWLANpriorityissettoPlatinum?（）

A.background
B.best effort
C.voice
D.video

多项选择题Whichthreeareinterframespacesdefinedin802.11?（）

A.SIFS
B.PIFS
C.DIFS
D.LIFS
E.NAV
F.CWmin

单项选择题WhatisthepayloadsizeofawirelessIPphoneinacallusingG.711codec?（）

A.20 bytes
B.60 bytes
C.120 bytes
D.160 bytes

单项选择题WhatcallperformancestatisticsarereportedontheCiscoWirelessIPPhone7921userinterface?（）

A.minimum jitter
B.maximum jitter
C.upstream standard packet deviation
D.average MOS value
E.average conceal rate