200-301: Cisco Certified Network AssociateDemo

For 2.4 GHz Wi‑Fi in the United States, the commonly accepted nonoverlapping 20 MHz channel set is 1, 6, and 11 because their center frequencies are spaced far enough apart to avoid adjacent-channel overlap. The other choices include overlapping channels or channel 14, which is not part of standard U.S. Wi‑Fi channel usage.