Quality of service is the ability to give different priorities to different applications, users, or stream, or to guarantee a certain performance level to the flow of data. This book brings all the elements of network quality of service (QoS) together in one volume, saving the reader time and expense of making some purchases. Chapters contributed by recognized experts covering the theory and practice of network quality of service (QoS), which allows the reader to develop a new level of knowledge and technical expertise.