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Presumably some snapshot id number also gets sent to the client and is what gets acked?

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...

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.)

They were ACKed as a part of the input command frames sent by the client to the server

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