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In a Wireless Sensor Network (WSN) data dissemination and data gathering are involved during the transmission of data from the source to the destination. Data dissemination is the process of routing data or queries throughout the network and data gathering is the collection of observed data from individual sensor node to sink. Routing is the process of moving the sensed data from the data source to the data sink. So far routing in sensor networks has focused upon methods for constructing the best route, or routes, from data source to sink before sending the data. Due to the inherent nature of these networks a sensor node may fail and hence the route may also fail.
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