多项选择题
Which three are benefits of U-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?（）
单项选择题 WhatistherecommendedCiscoDSCPvalueforaswitchorrouterpassingCiscoUnifiedWirelessIP Phone7921GRTPpackets?（）
单项选择题 WhichkeypadsequencewillresettheCiscoUnifiedWirelessIPPhone7921tofactorydefault?（）
