Wireless Sensor Networks (WSNs) consist of thousands of tiny nodes. A sensor network is composed of a large number of sensor nodes; having the capability of sensing, computation and wireless communications; which are densely deployed either inside the phenomenon (something known by sense perception) or very close to it. Many routing, power management and data dissemination protocols have been specifically designed for WSNs where energy consumption is an essential design issues. Application

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... fic wireless sensor networks have various routing protocols depending on application and network architecture. The study of various routing protocols presents a classification, as data-centric, hierarchical and location-based protocols. In this paper, we present a survey of the state-of-the-art routing techniques in WSNs. A comparison has been made between two routing protocols, Flooding and Directed Diffusion, on the basis of throughput and lifetime of the network. Simulation of AODV is also carried over two topologies with same source and destination node.