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综述了 Ｉｎｔｅｒｎｅｔ在区分服务（Ｄｉｆｆｅｒｅｎｔｉａｔｅｄ ｓｅｒｖｉｃｅｓ， Ｄｉｆｆｓｅｒｖ）研究方面的一些最新的工作，分析了 Ｄｉｆｆ－ｓｅｒｖ的体系结构、Ｄｉｆｆｓｅｒｖ的典型服务与技术，并着重论述了 Ｉｎｔｅｒｎｅｔ Ｄｉｆｆｓｅｒｖ所面临的问题，包括Ｄｉｆｆｓｅｒｙ与综合服务（Ｉｎｔｅｇｒａｔｅｄ ｓｅｒｖｉｃｅｓ， Ｉｎｔｓｅｒｖ）相结合的端到端服务质量（ＱｏＳ）提供机制、Ｄｉｆｆｓｅｒｖ网络中的组播（ｍｕｌｔｉｃａｓｔ）问题和Ｄｉｆｆｓｅｒｖ中带宽分配的公平性问题，及其进一步的研究方向。
This paper summarizes some recent Internet research work on Differentiated Services (Diffserv), analyzes the architecture of Diff-serv and the typical services and technologies of Diffserv. It also focuses on the problems faced by Internet Diffserv, including Diffsery and End service quality (QoS) providing mechanism based on integrated services (IntServ), multicast problems in Diffserv networks and fairness of bandwidth allocation in Diffserv, and further research directions.