Four-fold mechanisms are included: Slow Start, Congestion Avoidance, Fast Retransmit and Fast Recovery, which are the basis of congestion control algorithm.

• 其中介绍了拥塞控制算法的四个阶段:慢启动、拥塞避免、快速重传和快速恢复阶段,这四个阶段的算法也是拥塞控制算法最基础的算法。