It trully is amazing once you start to realise how important this flag is and how many functions it contains. The Window size field is the key to efficient data transfers and flow control. The reason behind this is because this field is of great importance. You will notice that the largest portion of this page is dedicated to the Window size field. Regardless of who the sender or receiver is, the field will always exist and be used.

This field is used by the receiver to indicate to the sender the amount of data that it is able to accept. The Window size is considered to be one of the most important flags within the TCP header. This means that while the values they contain will change, the total amount of space the field occupied will not. These values, like most of the fields in the protocol's header, remain constant in size, regardless of the amount of application data. The fifth section we are analysing here occupies a total of 6 bytes in the TCP header. So let's not waste any time and get right into our analysis! We see how TCP helps control how much data is transferred per segment, make sure there are no errors in the segment and, lastly, flag our data as urgent, to ensure it gets the priority it requires when leaving the sender and arriving at the recipient. Our fifth section contains some very interesting fields that are used by the TCP transport protocol.

Widow sizing in tiddlydesktop