Abstract
The Internet has grown rapidly in the last several years. This is largely due to the simple, flexible, and robust connectionless nature of the Internet Protocol (IP). The Internet architecture has been successful up to this point, and the best effort service paradigm has been adequate. However, with increasing demands of supporting voice, video, mission critic data on IP, the best effort paradigm without differentiating traffic according to application requirements can not meet the market demands. In this paper, we summarize and compare two major models in IP Quality of Service (QoS): Integrated Services Model and Differentiated Services Model proposed in Internet Engineering Task Force (IETF), the main Internet standard committee. We also discuss other related areas in IETF, e.g., Multiprotocol Label Switching and Resource Reservation Protocol in terms of their impacts on supporting QoS in IP.
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