多项选择题
Which two models are the models of DiffServ-Aware Traffic Engineering？ （）
A.Policy-based Model B.Class based Model C.Russian Doll Model D.Global Tunnel Model E.Maximum Allocation Model
多项选择题 WhichthreeareoptionalextensionsoftheFrameRelayLocalManagementInterfacespecification？（）
多项选择题 IntheCarrierSupportCarrier（CsC）feature，whichtwoprotocolsrunCSC-PEandCSC-CS？（）
单项选择题 WhichstatementaboutstandardSTS-1SONETframingistrue？（）
