单项选择题
A.duplicate sender packets
B.unicast packet retry rate
C.unicast packet retry ratio
D.association rejections
单项选择题 HowdoCiscoUnifiedCommunicationsIPphonesreceivefirmwareupgrades?（）
单项选择题 WhichdeployedVoWLANclientsecurityoptionisrecommendedbyCisco?（）
单项选择题 AnLWAPPencapsulatedpacketisbeingsentfromtheCiscoWLCv5.2totheAPforawirelessWMM client.CantheLWAPPframebealteredtochangetheresultingfinalWMMqueuefortransmissiononan 802.11client?（）