12. Conclusion: This is What It All Came Down To
To understand TCP and UDP, I read countless articles, wrote code myself, and debugged extensively. At first, I memorized "TCP is reliable, UDP is fast," but now I understand why.
My core takeaway:
- TCP sacrifices "speed" for "perfection."
- UDP sacrifices "completeness" for "speed."
- QUIC wants "both." That's why it built reliability on top of UDP.
Ultimately, network programming is about "understanding trade-offs and making choices." TCP for chat apps, UDP for games, QUIC for web services. Now I can confidently choose the right protocol for each project.
And next, I plan to build my own custom reliability protocol on top of UDP. I want to implement what QUIC did with my own hands. That's the real path to understanding.