TCP Congestion Control

This video explains how TCP control the congestion using Additive Increase Multiplicative Decrease (AIMD). TCP uses the slow start algorithm and takes the congestion window to 1 Maximum Segment Size (MSS). After the first ACK arrives, the size of the congestion window is increased by 1, which means that congestion window is now 2 and then after every Round Trip Time (RTT) congestion window set to 4,8 etc. in exponential way. After that
TCP goes into the next phase called Congestion Avoidance, in which it increases the congestion window additively instead of exponentially. The last is congestion detection phase, in which the size of the threshold is dropped to half as multiplicative decrease. And congestion window set to 1 again. This all phases are explains in this YouTube video using graph and example.

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