2. Protocol features
2.1 TCP segments
Figure 4 shows the format of a TCP segment and, in particular, the structure of the TCP header, aligned in 32-bit words. First of all, it is possible to send "empty" segments, i.e. those containing no data; these segments are used for signaling purposes 2.5 .
The first 20 bytes of the header correspond to the fields that must be present in any segment; however, a segment can also include...
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Protocol features
Data transport
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