AF differentiated services performance analysis

Internet applications such as email, ftp and real-time applications require different service performance guarantees. The Internet Engineering Task Force has proposed the Integrated Services (IntServ) model, which aims to provide these guarantees by reserving network resources for individual connections. However, there are two related issues arising from the deployment of IntServ: overhead traffic and poor scalability. As a result, Differentiated Services (DiffServ) has been proposed as an alternative for IntServ. DiffServ aims to provide the same service to groups of flows with similar Quality of Service requirements. Hence, it reduces the amount of overhead traffic and improves networks scalability.