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In another article about the network abstraction layer "NetChannel" [1], the author describes that ACK happens by sending "Sequence" numbers in the headers.

[1]: https://fabiensanglard.net/quakeSource/quakeSourceNetWork.ph...

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That’s about an earlier engine. Quite different.

(Regarding the original question, yes, of course there are sequence numbers. The “recommended readings” at the bottom of the page are worthwhile.)

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