TCP Congestion Handling and Congestion Avoidance Algorithms
By changing the window size that a device advertises to a peer on a TCP connection, the device can increase or decrease the rate at which its peer sends it data. This is how the TCP sliding window system implements flow control between the two connected devices. We've seen how this works in this chapter, including the changes required to the basic mechanism to ensure performance remains high by reducing the number of small segments sent.
Flow control is a very important part of regulating the transmission of data between devices, but it is limited in the following respect: It considers only what is going on within each of the devices on the connection, and not what is happening in devices ...
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