You have installed an 802.11ac Wi-Fi network that has three overlapping wireless access points. In order to provide the best bandwidth and avoid communication issues, what channel width should the access points be set to?

802.11ac operates in the 5 GHz band and has a bandwidth of 20, 40, or 80 MHz. There are actually two channels with an 80 MHz channel width: channels 36–48 and 149–161. You ought to choose the 40 MHz channel width, which offers four possible channels: 36-40, 44-48, 149-153, and 157-161, given that you have three access points. Nine channels are available at a channel width of 20 MHz, but you don't need that many, and a narrower channel width would result in worse performance per client. 36, 40, 44, 48, 149, 153, 157, 161, and 165 are the 20 MHz channels.