Which type of AAL does ATM utilize to deliver CBR traffic？（）

WhichtwomodelsarethemodelsofDiffServ-AwareTrafficEngineering？（）

A.Policy-based Model
B.Class based Model
C.Russian Doll Model
D.Global Tunnel Model
E.Maximum Allocation Model

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WhichthreeareoptionalextensionsoftheFrameRelayLocalManagementInterfacespecification？（）

A.switched virtual circuit
B.virtual circuit status
C.simple flow control
D.multicasting
E.permanent virtual circuit

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