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This paper focuses on Quality-of-Service (QOS) provided during sessions in a high-speed wide area network and briefly survey research in this area. Four approaches towards providing Quality of Service guarantees are described and discussed, e.g., the tightly controlled approach, the approximate approach, the bounding approach, and the observation-based approach. A survey research aimed at resolving the challenges and identify open issues involved in providing Quality of Service guarantees is discussed. In second section, several different approaches defining Quality of Service and discuss the fundamental challenges involved in providing performance guarantees were identified. In third section, four basic approaches for providing Quality of Service guarantees have been overviewed. Forth section concludes this paper.
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