多项选择题
What are two characteristics of the DiffServ model？（）
A.service guarantee B.traffic that is divided into classes C.not scalable to large implementations D.QoS mechanisms that are used without prior signaling E.applications that signal their particular QoS and bandwidth requirements
多项选择题 WhichthreedevicesareusedbytheCiscoWirelessControlSystem（WCS）forwirelessmanagement？（）
多项选择题 WhichtwoCiscoAutoQoSconfigurationstatementsaretrue？（）
多项选择题 Whenarouterconvertsanalogsignalstodigitalsignals，whatthreestepsarealwaysincludedintheprocess？（）
