Which statement about 802.11ax (Wi-Fi 6) is true?

• A. It operates exclusively in the 2.4 GHz band.
• B. It provides no improvement in efficiency in dense environments.
• C. It does not support OFDMA.
• D. It introduces OFDMA and improved efficiency for dense environments.

Answer: (D)

802.11ax is all about making Wi‑Fi work better when lots of devices share the same air. A core feature is OFDMA, which splits a single wireless channel into many smaller subchannels called Resource Units. By scheduling these subchannels to different devices at the same time, multiple users can transmit or receive simultaneously without waiting for a single busy channel to clear. This greatly reduces airtime waste and contention, delivering higher overall efficiency in crowded environments like apartments, offices, or stadiums. Wi‑Fi 6 also brings improvements to multi-user MIMO and power-saving features, and it operates in both the 2.4 GHz and 5 GHz bands (and 6 GHz with Wi‑Fi 6E). So the statement that it introduces OFDMA and improves efficiency for dense environments is the true one.