Ethernet ports and vacuum pump: what they have in common

1. Step 1. Ethernet ports — is part of — Router. Ethernet ports.
2. Step 2. Router — uses — Packet switching. It forwards packets.
3. Step 3. Packet switching — works like — Electrical telegraph. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.
4. Step 4. Electrical telegraph — has part — Electromagnet. Morse’s receiver.
5. Step 5. Electromagnet — is used in — Mass spectrometer. Deflecting ions with a field.
6. Step 6. Mass spectrometer — has part — Vacuum pump. A vacuum system.

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