Which frequency bands do all 802.11 standards use?

The correct answer highlights that all 802.11 standards utilize the 2.4 GHz and 5 GHz frequency bands. This dual-band approach allows for greater flexibility and compatibility across various devices and applications. The 2.4 GHz band, which has been in use for a longer time, provides a good range and is widely supported by older devices, while the 5 GHz band offers higher data rates and less interference due to fewer devices occupying that spectrum.

The significance of the 2.4 GHz band is that it has become a common frequency for many wireless devices, which helps in ensuring broader compatibility with various technology standards. On the other hand, the 5 GHz band is essential for achieving higher performance in less crowded environments, accommodating higher-throughput applications, and enabling features like MU-MIMO.

The other frequency options presented do not encompass all 802.11 standards. The 6 GHz band is associated with the newer 802.11ax (Wi-Fi 6E) standard, but it is not a band used by all 802.11 standards. The same applies to the 10 GHz and 3 GHz bands; these frequencies are not utilized by the 802.11 family, making the choice that incorporates both 2