フリー問題

問題文

An administrator is assigning channels to nine access points on one office floor in the 2.4 GHz band. Every radio is configured for a 20 MHz channel width. Which channel plan avoids overlapping channels?

選択肢

1. Only channels 1 and 6 and 11 avoid overlap in the 2.4 GHz band at the 20 MHz width used by most of the clients on this floor.
2. Every channel from 1 to 11 avoids overlap and the 2.4 GHz band holds 11 cells when the 20 MHz width is set.
3. Only channels 1 and 5 and 9 avoid overlap in the 2.4 GHz band at the 20 MHz width used by most of the clients in this building today.
4. Channels 1 and 6 and 11 overlap heavily in the 2.4 GHz band whenever the 20 MHz width is in use.