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In the tcp field option There are several options that can be added for example like mss But how if i don't use the SACK option, what kind of acknolegdment will I use cummulative?

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    Jan 11 at 7:21

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ACK is always cumulative - you ACK all data before the SEQ indicated and expect the next data segment starting with SEQ.

Selective ACK is an option to acknowledge data behind a missing segment without acknowledging the missing data itself.

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