FTP and radar: what they have in common

1. Step 1. FTP — uses — ARPANET. It appeared on ARPANET.
2. Step 2. ARPANET — has part — Router. The IMPs were the first routers.
3. Step 3. Router — has part — Antenna. Antennas.
4. Step 4. Antenna — is part of — Radar. An antenna emits and receives.

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