As the Internet and private internets grow in scale, a host of new demands march steadily into view. Low-volume Telnet conversations are leapfrogged by high-volume client/server applications. To this has more recently been added the tremendous volume of web traffic, which is increasingly graphics-intensive. Now real-time voice and video applications add to the burden.
To cope with these demands, it's not enough to increase Internet capacity. Sensible and effective methods for managing the traffic and controlling congestion are needed. Differentiated services provide a simple, easily implemented tool for supplying different levels of QoS to different groups of applications and users.