What Is a Three-Way Handshake in TCP ? Essential Networking Fundamentals For Network Scanning NMAP
A three-way handshake is a method used in a TCP/IP network to create a connection between a local host/client and server.
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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.
Multiple TCP socket connections can be transmitted in both directions simultaneously. 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.
In fact, its name originates from the three messages transmitted by TCP before a session between the two ends is initiated.
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