Παράδειγμα με syn - ack διαδικασία

When you are analyzing the sequence and acknowledgment process, keep in mind the following equation:
Sequence Number In + Bytes of Data Received = Acknowledgment Number Out
The following is a simplified explanation of how a sequenced communication may occur. (Remember that the acknowledgment number field contains the value of the next sequence number that is expected from the other side of the TCP communication.)
Host 1 ------>Sequence number 1 with 9 bytes of data Acknowledgment number field = 100
<------ Host 2 Sequence number 100 with no data (ACK) Acknowledgment number field = 10 (in 1 + 9 bytes of data)

Host 1 ------> Sequence number 10 with 5 bytes of data Acknowledgment number field = 100

<------ Host 2 Sequence number 100 with no data (ACK) Acknowledgment number field = 15 (in 10 + 5 bytes of data)

<------ Host 2 Sequence number 100 with 20 bytes of data Acknowledgment number field = 15
Host 1: -------> Sequence number 15 with no data (ACK) Acknowledgment number field = 120 (in 100 + 20 bytes of data)