Firewall and hydraulic press: what they have in common

1. Step 1. Firewall — uses — TCP/IP. It filters packets.
2. Step 2. TCP/IP — is used in — Internet. Networks are joined by the TCP/IP protocols.
3. Step 3. Internet — has part — Computer. The Internet links billions of computers.
4. Step 4. Computer — is used in — Flight simulator. Modern simulators are computer-based.
5. Step 5. Flight simulator — has part — Hydraulic cylinder. A motion platform.
6. Step 6. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

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