IEEE 802.11ac devices operate primarily in which band?

IEEE 802.11ac devices operate primarily in which band?

• A. 60 GHz
• B. 5 GHz U-NII
• C. 2.4 GHz ISM
• D. 900 MHz

Answer: (B)

IEEE 802.11ac is built to deliver high-throughput wireless LAN by using the 5 GHz U-NII band, not the crowded 2.4 GHz range. Operating in 5 GHz gives more available spectrum and allows wider channel bandwidths (such as 80 or 160 MHz), which directly enables the higher data rates that ac is known for. The U-NII designation means this 5 GHz spectrum is allocated for unlicensed Wi‑Fi use in many regions. In contrast, 60 GHz is used by a different standard (very high-speed, short-range links), the 2.4 GHz band is crowded with many devices and offers narrower channels, and 900 MHz isn’t used for standard Wi‑Fi.

IEEE 802.11ac is built to deliver high-throughput wireless LAN by using the 5 GHz U-NII band, not the crowded 2.4 GHz range. Operating in 5 GHz gives more available spectrum and allows wider channel bandwidths (such as 80 or 160 MHz), which directly enables the higher data rates that ac is known for. The U-NII designation means this 5 GHz spectrum is allocated for unlicensed Wi‑Fi use in many regions. In contrast, 60 GHz is used by a different standard (very high-speed, short-range links), the 2.4 GHz band is crowded with many devices and offers narrower channels, and 900 MHz isn’t used for standard Wi‑Fi.