Which two models are the models of DiffServ-Aware Traffic Engineering? (Choose two)

A.
Policy-based Model

B.
Class based Model

C.
Russian Doll Model

D.
Global Tunnel Model

E.
Maximum Allocation Model

Explanation:
Therefore in practice, a Network Administrator might prefer to use:
•the Maximum Allocation Model when s/he needs to ensure isolation across all Class Types
without having to use pre-emption, and s/he can afford to risk some QoS degradation of Class
Types other than the Premium Class.
•the Russian Dolls Model when s/he needs to prevent QoS degradation of all Class Types and can
impose preemption.