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Wireless Sensor Networks have emerged as an important new area in wireless technology. Wireless Sensor Networks (WSN) consists of numerous tiny sensors deployed at high density in regions requiring surveillance and monitoring. There are many existing protocol, techniques and concepts from traditional wireless network, such as cellular network, mobile ad-hoc network, wireless local area network and Bluetooth, are applicable and still used in wireless sensor network, but there are also many fundamental differences which lead to the need of new protocols and techniques. Analysis of various Routing protocols via simulation suitable for WSN. The design of routing protocols for WSN's must consider the power and resource limitation of the network nodes, the time varying quality of wireless channels and possibility of packet loss and delay. To address these design requirements several design strategies for WSN's have been proposed. AODV, DSDV, LEACH, some of the common protocols. Each has its fair share of advantages and limitation.

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