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A wireless sensor network composed of many sensor nodes which are used to monitor unavailable and harsh environments. Because these nodes are too small and battery operated which have limited energy, faults may occur. Fault tolerance is one of the most important issues in wireless sensor networks and must be increased as much as possible to avoid faults. In wireless sensor networks which use clustering architecture, the role of cluster head is very important and critical and fault tolerance in cluster head must be increased. Different approaches for increasing fault tolerance and fault management presented that have advantages and disadvantages.
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