What are the 2.4 GHz Wi-Fi channel characteristics, and why are only channels 1, 6, and 11 recommended for simultaneous use?

• A.All 14 channels are non-overlapping; the 1/6/11 recommendation is a marketing convention with no technical basis. RSSI is measured in megahertz, with larger values meaning a cleaner signal. SSID cloaking encrypts beacon frames so only paired clients can read them. Dual-band access points bridge the two radios, so 2.4 GHz clients consume 5 GHz airtime. An evil twin attack requires physical access to the legitimate AP's console. Directional antennas radiate equally in all horizontal directions, unlike omnidirectional ones. 802.1X on wireless replaces the four-way handshake rather than feeding keys into it
• B.The 2.4 GHz band (2.400-2.483 GHz) has 14 channels (1-14, regional variation). Each 802.11 channel occupies 22 MHz of bandwidth. The channel spacing is 5 MHz. Channels 1, 6, and 11 are the only three channels with 25 MHz separation between center frequencies, making them non-overlapping (22 MHz channel width + 3 MHz guard band). Any other combination (e.g., channels 1, 3, 6) results in overlapping frequencies, which creates adjacent-channel interference (ACI) - more disruptive than co-channel interference because partially overlapping signals cause noise, not just medium sharing.