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Great context for the four layer model and TCP/IP
TCP Explained
Additional Reading
https://www.computerhope.com/jargon/t/tcpip.htm
https://en.wikipedia.org/wiki/Transmission_Control_Protocol
https://www.guru99.com/tcp-ip-model.html
https://www.plixer.com/blog/network-layers-explained/
TCP/IP and UDP Compared