What is the order of messages in a three-way handshake?

In a three-way handshake, the process establishes a TCP connection between a client and a server. The correct sequence of messages is critical for proper handshake and connection establishment.

The order starts with the client sending a SYN (synchronize) message to the server. This initiates the connection request. Next, the server responds with a SYN/ACK (synchronize/acknowledge) message, acknowledging the receipt of the SYN request and also sending its own SYN to the client. Finally, the client sends an ACK (acknowledge) message back to the server to confirm that it has received the SYN/ACK, completing the handshake.

Thus, the correct order is SYN, SYN/ACK, ACK. This sequence ensures that both parties agree to the terms of connection and are ready to exchange data. Understanding this order is fundamental in networking concepts, making it a critical component for those preparing for the GSEC and working with network protocols.