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Conventional TCP suffers from poor performance on high bandwidth delay product links meant for supporting transmission rates of multi Gigabits per second (Gbps). This is largely due to TCP's congestion control algorithm, which can be slow in taking advantage of large amounts of available bandwidth. A number of high-speed variants have been proposed recently, the major ones being BIC TCP, CUBIC, FAST, High-Speed TCP, Layered TCP, Scalable TCP and XCP. In this paper an effort has been made to comparatively analyze the aforementioned protocols based on various parameters viz., throughput, fairness, stability, performance, bandwidth utilization and responsiveness and study the limitations of these protocols meant for the high speed networks.
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