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The TCP 3-way handshake
Revision card: The TCP 3-way handshake. Easy English, with a real example. Scan the QR for the full lesson.
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What this card says
| Step | Packet |
|---|---|
| Client to server | SYN |
| Server to client | SYN-ACK |
| Client to server | ACK (connected) |
In one line
TCP opens a reliable link with three steps: SYN, SYN-ACK, ACK.
Note
Example: your browser opens this handshake before loading a page.
Learn more in the lesson: 3.5 The TCP 3-Way Handshake, TCP Flags and Connection Close