Data Communications Networking Devices Operation, Utilization and LAN and VAN Internetworking Fourth Edition Gilbert Held 4-Degree Consulting, Macon, Georgia, USA Data communications continue to grow enormously as a key part of telecommunications. Technological advances mean up-to-date information is essential. This fourth edition of the popular and authoritative text Data Communications Networking Devices examines the characteristics, operation and applications of the devices used to construct a data communications network....