![]() ![]() ACK - The acknowledgment flag is used to acknowledge the successful receipt of a packet.The following diagram illustrates a three-way handshake process. Only the first packet from both the sender and receiver should have this flag set. SYN - The synchronization flag is used to establish a three-way handshake between two hosts.Additionally, check out the corresponding RFC section attributed to certain flags for a more comprehensive explanation. The list below describes each flag in greater detail. List of TCP flagsĮach TCP flag corresponds to 1 bit in size. ![]() However, this post will go through the complete list of TCP flags and outline what each one is used for. There are a few TCP flags that are much more commonly used than others, such as SYN, ACK, and FIN. Therefore, they can be used for troubleshooting purposes or to control how a particular connection is handled. TCP flags are used within TCP packet transfers to indicate a particular connection state or provide additional information. ![]()
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