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?

  • Has any answer solved your question? Then please accept it or your question will keep popping up here forever. Please also consider voting for useful answers.
    – Zac67
    Jan 11 at 7:21

1 Answer 1


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.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.