Which three are interframe spaces defined in 802.11?（）

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

单项选择题WhichstatementdescribesthecallbehavioroftheCiscoUnifiedWirelessIPPhone7921Gwhenit roamsfrom802.11bto802.11a?（）

A.The phone does a directed call hangup on 802.11b，then does an auto-redial on 802.11a，creating a  new call.
B.The phone does a directed call hangup on 802.11b， then the user does a redial on 802.11a，creating a  new call.
C.The phone does a disassociation on 802.11b and an association on 802.11a，and call remains up if the  subnet has not changed.
D.The phone does not roam from 802.11b to 802.11a when on an active call.
E.The phone must switch network profiles to roam from 802.11b to 802.11a.

多项选择题WhichtwopiecesofinformationdoestheCiscoWLCv5.2clientmonitorfeatureprovideabouta VoWLANclient?（）

A.RSSI of the client at the access point
B.WMM state
C.current MOS value
D.current RF channel
E.current transmit data rate

单项选择题WhichconfigurationisrequiredforaVocerabadgetofunctionproperlyonaCiscoWLC?（）

A.disable higher data rates
B.set DTIM = 1
C.disable RRM
D.disable broadcast SSID
E.disable multicast