About this interactive
The lesson's scales, smallest to largest:
- **NFC (near field communication):** devices almost touching, within about an inch and a half. Two phones bumped together, or a phone tapped to pay.
- **PAN (personal area network):** within about 30 feet of your device, such as Bluetooth earbuds or speakers.
- **LAN (local area network):** locally connected devices on a switch, one broadcast domain.
- **CAN (campus area network):** several LANs across a college or business campus.
- **MAN (metropolitan area network):** sites spread across a city, such as one company's campuses around town.
- **WAN (wide area network):** beyond a city, across a country or the globe.
Scale is the deciding fact: a link between routers in different states is a WAN link even if it runs Ethernet, a LAN technology.
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