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The fault tolerant and reliable dissemination is an important issue in WSN, due to the deployment of sensor nodes in hostile environment. Most of the clustering algorithms are concentrated to increases the network lifetime and reduces the energy consumption among the sensor nodes and do not consider the reliability of the networks. Fault tolerance techniques detect and recover the sensor nodes from hardware and software failure to increase the reliability of the networks. In this paper, the authors study the different approaches for fault tolerant issues and they summarize and compare the current work that has been done in fault tolerant for clustering algorithm.
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