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  • Rickard Korkko thinks this is interesting:

Window Size is a 16-bit field used for flow control.

From

Cover of Routing TCP/IP, Volume 1, 2/e

Note

What's the purpose of the Windows size field in the TCP header? #TCP url:https://www.safaribooksonline.com/library/view/routing-tcpip-volume/1587052024/graphics/01fig17.gif