Data Communications Networking provides an introduction to the principles of modern, multi-media types of communication and uncovers the underlying mechanisms of network concepts. As a considerable number of concepts appear in the two most prominent protocol suites, TCP/IP and ATM, Data Communications Networking presents the multitude of basic network concepts in an organized way that clarifies their interrelations. The importance of each concept is placed in the overall picture of a communications infrastructure. By contrasting the two main protocol suites, the different architectural viewpoints stand out, enriching a discussion on networking.