A Transmission Control Protocol (TCP) connection is established and two devices ensure that they're speaking the same protocol. What has occured?

The answer is "Three-way handshake".

Explanation:

In this mechanism, two processes associated with communication throughout SEO techniques. In this, the sequence of data packets and recognized by the number of exchanges during the threefold handshake process.

This method initiating the process between two apps,  Handshaking begins whenever a computer sends the message to its system. The process of the communication system has been established into the two devices,  which simply send many messages, which allow them to settle the protocol for communication.

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