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The study of Wireless Sensor Networks (WSNs) and its routing protocols becomes challenging because it requires an extremely large breadth of knowledge from an extremely large variety of disciplines. WANs basically consists of small devices called sensor nodes having the capability of sensing the environment around them, computation the task, and performing wireless communications with other connected nodes in the network. Nowadays the main area of interest amongst researcher is the development of energy efficient routing protocols in WSNs, so that the lifetime of sensors is enhanced. In this paper, the authors present a survey of the state-of-the-art routing techniques for WSNs from the recent work; highlighting their objectives, features, complexity, etc.
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