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Wireless Communication Basics

Which frequency band does an IEEE 802.11ac (Wi-Fi 5) wireless LAN use?

  1. AOnly the 2.4 GHz band
  2. BBoth the 2.4 GHz and 5 GHz bands
  3. COnly the 5 GHz band
Show answer and explanation

Answer: C. Only the 5 GHz band

Each IEEE 802.11 standard specifies the bands it uses. 802.11b and 802.11g use the 2.4 GHz band, 802.11a and 802.11ac use the 5 GHz band, and 802.11n (Wi-Fi 4) and 802.11ax (Wi-Fi 6) use both the 2.4 GHz and 5 GHz bands. 802.11ax extended to the 6 GHz band is called Wi-Fi 6E. Even on an access point supporting both 2.4 GHz and 5 GHz, 802.11ac communication takes place only on the 5 GHz side.

  • A. 802.11b and 802.11g use only the 2.4 GHz band.
  • B. 802.11n and 802.11ax use both bands.
  • C. Correct. 802.11ac operates only in the 5 GHz band.
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