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The main reason for network congestion is using TCP/IP protocol for transmission. In this paper, the technique called bandwidth estimation is used to avoid congestion in the network which uses TCP/IP protocol mechanism. It finds out the equilibrium point of the window and then the size of the window is adjusted in a round trip time. Initially the TCP and Active Queue Management technique is discussed on congestion avoidance. Then with the bandwidth estimation technique congestion control is achieved, and it is proved to be better than TCP Vegas both in the homogeneous and heterogeneous systems.
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