Firewall and electric motor: what they have in common

1. Step 1. Firewall — uses — TCP/IP. It filters packets.
2. Step 2. TCP/IP — is used in — Router. IP routing.
3. Step 3. Router — has part — Antenna. Antennas.
4. Step 4. Antenna — is part of — Pager. It receives the signal with an antenna.
5. Step 5. Pager — has part — Vibration motor. Vibrating alert.
6. Step 6. Vibration motor — is a kind of — Electric motor. A vibration motor is a tiny electric motor with an unbalanced weight.

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