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2.11.1. Channels and Bands
2.4 GHz Band:
- 11 channels in US (13 in most other countries)
- Only channels 1, 6, and 11 are non-overlapping
- Longer range, but more interference (microwaves, Bluetooth)
- 20 MHz channel width
5 GHz Band:
- 24+ non-overlapping channels (varies by region)
- Shorter range, less interference
- Supports wider channels (40, 80, 160 MHz)
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⚠️ Exam Trap: In a multi-AP deployment, adjacent APs should use non-overlapping channels (1, 6, 11 for 2.4 GHz) to avoid co-channel interference.