Date Added: Jan 2012
An explosive growth in business applications using the Internet have resulted in a strong demand for some notion of reliability or quality of service. During periods of congestion or failure, the quality of service of all flows is degraded. As a result, a strong need for service differentiation in the flows to provide guarantees and/or assuring minimum throughput guarantees. To provide quality of service QoS, the Internet Engineering Task Force (IETF) has proposed the Integrated Services (Int-Serv) model and the Differentiated Services (Diff-Serv) model. The Int-Serv model provides per-flow QOS guarantees, but does not scale well with the number of users.