In the Security+ exam, the wireless channels go from channel 1 up to channel 11, and the device placement should be:
- Channel 1: Your first wireless device
- Channel 11: Your second wireless device
- Channel 6: Your third wireless device
We place the devices as far apart as possible to prevent overlap of adjacent channels and interference. Wireless devices can suffer interference from elevators, baby monitors, cordless phones, metal racking, and load-bearing walls.