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Wireless sensor network is a network of tiny, autonomous sensor nodes. Nodes of these networks functions as a hosts and routers which discovers and maintains the routes to other nodes in the network. In such networks, nodes are able to move and synchronize with their neighbors. Due to mobility, connections in the network can change dynamically and nodes can be added and removed at any time. In this paper, the authors are going to compare wireless sensor network's routing protocols AODV, DYMO and OLSR using network simulator NS-2.34. They have compared the performance of three protocols together.