This text describes approaches to computer and communication network management at the ATM layer of the protocol hierarchy. The focus is on satisfying quality-of-service requirements for individual connections. Results in both areas of bandwidth scheduling and traffic control are explained. Recent results in end-to-end performance, provisioning for video connections and statistical multiplexing are also described. All of the material has been updated where appropriate and new references added and expanded. Timely updates are: a new chapter on ATM switches with an emphasis on scalable-to-terabit switching; new material on round-robin scheduling, jitter control, QoS paradigms as well as special treatment of fluid modelling and variable bit rate channel capacity; expanded coverage of CBR channels, IP over ATM and guaranteed-rate performance; and substantial increase in end-of-chapter exercises. Solutions for selected exercises are in the separate appendix. Complete solutions for all exercises are also available from author.