TCP Transmission Rate Adjustment TCP ADJUST ITS RATE TO AVOID CONGESTION IF AT ALL POSSIBLE. IF NO PACKETS ARE LOST, THE SENDING RATE IS INCREASED SLIGHTLY. IF A PACKET IS LOST, THE RATE IS CUT IN HALF. SLOW START WHEN A CONNECTION IS FIRST ESTABLISHED, THERE IS NO WAY TO ESTIMATE THE BOTTLENECK RATE. TCP PLAYS IT SAFE BY STARTING WITH A LOW TRANSMISSION RATE (i.e. IT GUESSES THAT THE BOTTLENECK RATE IS LOW). "SHORT" CONNECTIONS WILL PERFORM POORLY!

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This page is part of a section of lecture slides related to " Network Congestion " within the topic "Data Delivery Obstacles". Other slides within this section and other sections of slides for the topic "Data Delivery Obstacles" can be accessed using the links below. Retransmission Techniques Acknowledgements and Retransmission Retransmissions and Timeouts Sequence Numbers Sequence Numbers (cont.) Message Reordering Reliability and Connections A Reliable Delivery Problem Cautious Generals Solving the General's Problem Solving the General's Problem (cont.) Connections Establishing Connections Persistent HTTP Connections Network Congestion Packet Loss and Congestion Congestion and Transmission Rate Congestion and TCP Connections Finding the Bottleneck Rate TCP Transmission Rate Adjustment Error Detecting Codes Damagaged Data Symbols and Meaning Interpreting Binary Symbols Evaluating Codes Error Detecting Codes Parity Codes for Error Detection Multiple Bit Errors Interleaved Transmission Error Correcting Codes Any Guesses? Digital Recording on Compact Discs Two-dimensional Parity Bits Spatial Interleaving