The client node receives the SYN/ACK from the server and responds with an ACK packet. Step 3: Client node receives the SYN/ACK from the server and responds with an ACK packet This sequence indicates that the server correctly acknowledged the client’s packet, and that is sending its own to be acknowledged as well. The second one is the SYN sent by the server, which is another random sequence number (for example, Y). The first one is ACK one, which is set by the server to one more than the sequence number it received from the client (e.g.
This packet includes two sequence numbers. When the server receives the SYN packet from the client node, it responds and returns a confirmation receipt – the ACK (Acknowledgement Sequence Number) packet or SYN/ACK packet. Step 2: The server receives the SYN packet from the client node The objective of this packet is to ask/infer if the server is open for new connections. This SYN packet is a random sequence number that the client wants to use for the communication (for example, X). The client node sends a SYN (Synchronize Sequence Number) data packet over an IP network to a server on the same or an external network. The Three Steps of a Three-Way Handshake Step 1: A connection between server and client is establishedįirst, a connection between server and client is established, so the target server must have open ports that can accept and initiate new connections. For example, it supports communication between a web browser on the client side and a server every time a user navigates the Internet.Īs soon as a client requests a communication session with the server, a three-way handshake process initiates TCP traffic by following three steps. Techopedia Explains Three-Way HandshakeĪ three-way handshake is primarily used to create a TCP socket connection to reliably transmit data between devices. In fact, its name originates from the three messages transmitted by TCP before a session between the two ends is initiated. A three-way handshake is also known as a TCP handshake or SYN-SYN-ACK, and requires both the client and server to exchange SYN (synchronization) and ACK (acknowledgment) packets before actual data communication begins.
Multiple TCP socket connections can be transmitted in both directions simultaneously. It is a three-step method designed to allow both communicating ends to initiate and negotiate the parameters of the network TCP socket connection at the same time before data such as HTTP and SSH is transmitted.
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