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Why need Ack flag if we already have ack number in TCP 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 nearly always the case, but it isn't while a connection is being established Acknowledgment Number: 32 bits If the ACK control bit is set this field contains the value of the next sequence number the sender of the segment
Window Size and ACK Number - Network Engineering Stack Exchange Copy-pasting from my lecturer's slides: • Receiver indicates the window size is 3000 • Transfer goes ahead • Acknowledge every 3000 bytes • Receiver increases window size to 4000 • 4000 bytes
NACK vs. ACK? When to use one over the other one? 23 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 situations would one use ACK over NACK and viceversa?
Why is TCP acknowledging all the time? 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 Suppose A
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 unacknowledged segments Each side is a peer (client server is an application concept), and both sides must agree that everything is done
Server does not send FIN ACK response, but instead ACK with out of . . . This "weird ACK" with a sequence number one higher than the received FIN is the acknowledgement for the FIN This is how TCP is supposed to work So there is nothing weird here, just a normal half-closed TCP connection, i e one side called shutdown and the other not yet A TCP FIN just means that the sender will not send more data and it does not require the peer to stop sending too
TCP ACK confusion - Network Engineering Stack Exchange 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 doesn't have a client server concept There are two hosts, each of them able to send and receive Clients and servers only exist in the application layer
Why does a pure ACK increment the sequence number? I cannot figure out why a pure ACK will increment the sequence number of the sending host by 1 when the TCP segment contains only a header, such as in the third segment in a three-way handshake for establishing a TCP connection