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How TCP Really Works

Most developers know TCP is 'reliable' — but what does that actually mean under the hood? Sequence numbers, SYN floods, slow start, and the three-way handshake demystified.

2 min read May 28, 2026
1 posts page 1 of 1 2+ min reading
topics all databases systems design backend devops networking security
~/networking/how-tcp-really-works.md
$ cat how-tcp-really-works.md
How TCP Really Works
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How TCP Really Works
networking 2 min read

Most developers know TCP is 'reliable' — but what does that actually mean under the hood? Sequence numbers, SYN floods,…

May 28, 2026