TCP Congestion Control

• Window flow control: avoid receiver overrun

• Dynamic window congestion control: avoid/control network overrun

  • Observation: Not a good idea to start with a large window and dump packets into network
  • Treat network like a black box and start from a window of 1 segment (“slow start”)
  • Increase window size exponentially (“exponential increase”) over successive RTTs => quickly grow to claim available capacity.

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