Computer Networks: A Systems Approach is a carefully focused revision of the best-selling first edition, updated to incorporate user feedback and reflect the most recent changes in networking technology.Inside, a systems approach focused on the Internet promotes an enduring, practical understanding of networks and their building blocks. Each chapter begins with the statement of a problem that frames the following discussion. The authors then develop complete solutions, illustrate them with real-world examples-including specific protocol references and C code-and address topical issues debated throughout the networking community.The result? Readers learn the why of network design-not just the facts surrounding current systems but the principles at work in their application and evolution. No other textbook offers a more solid grounding or better preparation for a career in networking.Features * The authors bring over 20 years of experience in networking research, development and teaching to the task of describing the principles and practical implementation of computer networks. * Includes all-new chapters on security techniques and application-layer protocols, and new material on wireless and mobile technology and VPNs. * Expands coverage of internet routing, ATM, quality of serivice, and multimedia communication. * Highlights key design principles, probes controversial networking issues, provides the definitive references on each topic, and includes over 100 new exercises. * Presents implementation examples in easy-to-understand C code.