What Is The First Way of The Three-Way Handshake?

You want to know discretely what the first way of the three-way handshake is in the context of TCP/IP networking. What is it?

Short Answer
It is the sending of a TCP packet with a flag of "SYN" from the client to the server/destination.

Longer Answer
TCP is used in HTTP communications. TCP uses a three-way handshake; each way has a specific flag in a TCP packet and a specific source and destination (among the two end point devices involved). When a workstation tries to connect to a website (e.g., https://www.continualintegration.com), the workstation sends a TCP packet with a SYN flag to www.continualintegration.com.

The first way is sending a TCP packet with the "SYN" flag (of which several potential flags are possible) to the destination:
Client -----> Server

To read more, see these postings:
What Is The Second Way of The Three-Way Handshake?
What Is The Third Way of The Three-Way Handshake?

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