TCP Congestion Control Algorithms: Overview

• Slow start

• • Starting with one or two packets, aggressively increase the sliding window
  • Reenter this mode upon loss

• Congestion avoidance

• • Once a certain window size is reached, increase it much more slowly

• Fast retransmission / fast recovery

• • A packet has been lost, but other packets that were sent after it were received
  • Resend the lost packet and throttle down the transmission rate without entering slow start