![]() Header length: This represents the TCP header length in double words.Sequence and acknowledgement numbers work together to make TCP a reliable protocol, one that knows how much data has arrived at the destination and what data is lost and needs to be retransmitted.Acknowledgement number = (Amount of data received) + Sequence number.Acknowledgement number: A destination acknowledges received data, by sending a response to the sender with the ACK flag set and with a number whose value is the amount of data in received segment + sequence number.Its value increases by the number of bytes in a payload and hence another way of thinking about it, is that it allows to calculate the amount of data has flowed in a connection. Sequence number: Sequence number allows multiple segments within a single TCP stream to be ordered correctly at the destination.Source port is typically greater than 1024 and the destination port refers to the service/application that the server is awaiting connections on, such as 443 for SSL or 80 for HTTP. ![]()
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