多项选择题
Which three functions can an Integrated Services Router perform in a VoIP network？（）
A. voice stream mixing for conference calling B. voice gateway C. call admission control D. analog or digital phone interfaces E. XML application services F. large scale dial plan application
单项选择题 WhichoftheitemsstatedistypicallythemostexpensivemethodofimprovingQoSacrossWANlinks？（）
单项选择题 WhenQoSlevelsintheCiscoWirelessControlSystem（WCS）areentered，whichprofilenamesareusedtoidentifytheaccesscategories？（）
多项选择题 WhichtwostatementsabouttheWi-FiMultimedia（WMM）standardaretrue？（）
