The Wireless Sensor Network (WSN) gathers data§through the sensor nodes from an area of interest and§then processes it. The performance of WSN is,§however, constrained by limited energy supply,§requirement for collision free channel access and low§bandwidth. This book focuses on the network layer of§the OSI model and investigates some of the existing§cluster-based hierarchical protocols. One of the§problems of the existing algorithms is that the§generated clusters are not uniformly distributed.§Moreover, the optimum number of cluster formation is§not guaranteed. We have proposed a hierarchical§cluster-based algorithm called Iterative Cluster§Formation (ICF). ICF forms the clusters iteratively§and ensures a more uniform distribution of the§cluster heads. ICF manages to control the placement§of the cluster heads and guarantees an optimum number§of cluster heads. ICF pursues a hierarchical§clustering scheme which lowers the number of§high-range transmission. Simulation results show that§ICF performs better than the existing cluster-based§protocols in terms of reducing the energy dissipation§and increasing the network lifetime significantly.