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In the recent past, Wireless Sensor Networks (WSNs) have developed very fast and have been applied in a wide variety fields. As a consequence, lots of researches have been done concerning different aspects of WSNs. Since WSNs are always designed according to specially requirement, thus it is hard to have an uniform design to cover all kinds of WSNs. Here in this paper, the authors are going to have a brief look at the wireless sensor networks, focusing on energy-efficient routing, data transport security and other aspects of WSNs.
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