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DiffServ is assumed as a scalable solution for service differentiation in the Internet. It applies differentiated behaviors on data packets for different quality levels on a per hop basis (PHB). However, it does not have any control on the traffic entering the network and the paths which are traversed by data packets. Therefore, if no complementary mechanism is used with DiffServ, the end-to-end service accuracy and scalability requirements will not be achieved jointly in a service environment.