Networking is one of the most important aspects of Wireless Sensor Networks (WSNs). There are a variety of networking issues that must be addressed in order to realize the vision of WSNs, such as network architecture, medium access control, routing and data dissemination, topology control, node clustering, time synchronization, node localization, and fault tolerance. This book introduces to researchers, students, and practitioners the fundamental concepts, major issues, and state-of-the-art solutions in the networking wireless sensors.