To gain a better understanding of SYN and ACK packets, read the following:
- ACK. TCP/IP demands that both the source and destination systems transmit and receive acknowledgement messages to confirm the safe and proper transfer of data. These acknowledgement messages are known as ACK messages or ACK packets. For example, suppose there are two systems, A and B, and that A sends the first (X1) of a series of packets to B. A will not send the second packet in the series (X2) to B until B acknowledges that it received the first packet (ACK X1). If A does not receive an ACK message, then a timed-out occrs, and A will resend the data to B.
- SYN. A SYN packet is noting but a normal TCP packet with the synchronize (SYN) flat switched on. This flat indicates that the sender wants to establish a three-way TCP/IP connection with the destination system.
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