I. Introduction
This E-learning have an enormous number of clients today and number of them increase every day. This causes many elearning web sites and applications receive huge number of requests in a very short period of time. In this situation, response time of many e-learning web sites increases and even causes the operation of web sites in unstable state [2]. Also one of the important features of the e-learning environment is the collaboration. Collaboration implies the use of many different tools, each requiring specific Quality of Service (QoS) in terms of bandwidth, delay and jitter [3].