Written for the network engineer, this is an easy to follow, yet comprehensive guide as to what Quality of Service technologies are available to deliver deterministic performance in modern packet switched networks. As network applications converge onto a common packet-based infrastructure, delivering Quality of Service for real time traffic has become a critical part of network design. IP and Ethernet based networks, by their very nature, are not best suited to deliver Quality of Service and over the years, there have been many initiatives to address the fundamental issues.This book looks at the differences between packet based and circuit switched networks and the challenges network designers face when migrating applications from circuit switched technologies to packet based infrastructures. This book covers all the relevant topics, which include key Quality of Service models such as Integrated Services and Differentiated Services.