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Transport Layer (TCP (Congestion Control (Approaches towards congestion…

- - - - longer than RTT
      - too short: premature timeout
        unnecessary
        retransmissions
      - too long: slow reaction to segment loss
    - - SampleRTT: measured time from segment transmission until ACK receipt
      - SampleRTT will vary
  - - - End-end congestion control
      - Network-assisted congestion control
    - - additive increase
      - multiplicative decrease
    - - Fairness and UDP
        
        Multimedia apps often do not use TCP Instead use UDP
        
        Research area: TCP friendly
        
        Fairness and parallel TCP connections
- - - - acknowledgements (ACKs)
      - negative acknowledgements (NAKs)
    - - error detection
      - receiver feedback
- - - - no handshaking