In this section, we'll take a look at how TCP works, what's in the TCP header, and some of the flags and options.
If you'd like to learn more about TCP, you can look at the RFC that's available from the IETF at https://tools.ietf.org/html/rfc793:
You're looking for RFC: 793 for TCP, which is the original specification for TCP.
In the preceding screenshot, you can see different sections within IETF, which provide a little bit of interactivity. You can click on the different RFCs that have updated the TCP specifications; if you scroll down, it also provides you a nice little table of contents. The RFC shows a little diagram of ...
