UYLESS BLACK is a widely respected telecommunications consultant and lecturer with extensive operations and implementation experience in both public and private networks. His clients include Nortel Networks, British Telecom, and major carriers throughout the United States, Europe, and Asia. His recent Prentice Hall PTR books include Optical Networks: Third Generation Transport Systems; Voice Over IP, Second Edition; IP Routing Protocols; and Networking 101. He is also the creator of Uyless Black's Networking 101 Training Course (PTG Interactive).