Why need Ack flag if we already have ack number in TCP
Mar 19, 2022 · The ACK flag indicates that the Acknowledgment Number field is significant, ie. containing a meaningful value. When a socket connection has already been established that is …
NACK vs. ACK? When to use one over the other one?
Jan 12, 2016 · 24 Personally I don't even feel that there is a need for ACK. It's faster if we just send NACK (n) for the lost packets instead of sending an ACK for each received packet. So when/which …
Why do I see a RST, ACK packet instead of a RST packet?
Why do you think there should be a RST segment before RST/ACK? Maybe you could provide an example of such a packet trace?
Why is TCP acknowledging all the time?
Jan 7, 2018 · I understand seq/ack is used to provide a reliable connection service. But it seems that during TCP data transmission the ACK bit is ALWAYS set, as demonstrated in the following picture. …
Why is the last ACK needed in TCP four way termination
The question of why the last ACK is required is just that nay FIN only means that the sender of the FIN is done sending, and it must still be open to receive more segments, and it must resend any …
TCP Duplicate Acknowledgement - Network Engineering Stack Exchange
Dec 10, 2023 · Then the receiver will sending an duplicate ACK to sender, so whenever sender receive 3 duplicate ACK then the sender will retransmit the loss segment. But in this case where segment …
TCP ACK confusion - Network Engineering Stack Exchange
Apr 8, 2021 · The receiver can also selectively ACK (SACK) 51-100 to avoid a retransmission of successfully received segments. Without selective ACK, the sender retransmits 50-100. Note that …
tcp - what's the acknowledgement number after retransmitting the ...
Aug 17, 2020 · The very first ACK is correct. The acknowledgement number is the next expected segment number, and it acknowledges everything prior to that segment number, so the diagram is …
For TCP, what is the justification that ACKs are Last Byte Received + 1 ...
Jun 9, 2022 · Intuitively, it makes more sense that the ACK be the last byte received. Essentially, the receiving end says. I have received up to N bytes Then, the sender will receive that ACK that says N …
Why the TCP client haven't receive the ACK response, it send the FIN ...
Sep 3, 2019 · If the receiver doesn't receive data, it will send a duplicate ACK to the sender. So the sender waits for a time and if it doesn't receive acknowledgment of the FIN or data within this time, or …