Rigorous experimentation is emerging as the preferred method for validating the benefits of protocols, especially those affecting quality of service. The emulation of traffic generators provides a compact and efficient method for testing protocols and techniques in a realistic context. Models of user behavior serve as the basis for the trafgen traffic emulator and are subject to refinement as our knowledge expands. The project in this study uses a layered approach to study different Internet applications and protocols including the hypertext transfer protocol, http.