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In Mobile Ad hoc NETworks (MANETs) obstruction occurs due to the packet loss and it can be successfully reduced by involving congestion control scheme which includes routing algorithm and a flow control at the network layer. To maintain and allocate network resources effectively and fairly among a collection of users is a major issue. The resources shared mostly are the bandwidth of the links and the queues on the routers or switches. Packets are queued in these queues awaiting transmission. When too many packets are contending for the same link, the queue overflows and packets have to be dropped.