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TCP Three-Way Handshake with nc
The server starts first with nc -l 8080, which opens TCP port 8080 and waits for incoming connections.
Next, the client runs nc 127.0.0.1 8080. TCP then establishes the session through the three-way handshake: the client sends SYN, the server replies SYN-ACK, and the client returns ACK.
After the handshake completes, the channel is full-duplex: hello from client arrives at the server, and world from server returns to the client over the same established TCP session.
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