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With the increasing number of real-time Internet applications, "The best-effort service" has become insufficient to satisfy the needs of end users. The provision of predictable service levels for different types of application in the IP networks has been a subject of active research over the past decade. As a result, IETF has defined two Quality of Service (QoS) architectures: Integrated Services (IntServ) and Differentiated Services (DiffServ). The aim of this paper is to analyze the QoS aspects in the context of these architectures as well as to discuss the possibilities of integration between them.
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