Which of the following standards operates on a frequency of 5 GHz?

The 802.11a standard operates on a frequency of 5 GHz. This standard, released in 1999, was one of the first wireless networking standards to use the 5 GHz band, allowing for more channels and potentially less interference compared to the 2.4 GHz band used by earlier standards.

Operating in the 5 GHz range, 802.11a supports data rates up to 54 Mbps, which is beneficial in environments with higher bandwidth requirements. Its ability to provide multiple non-overlapping channels results in a clearer signal, which contributes to better performance in congested environments.

The other standards mentioned have their respective frequency ranges. For instance, 802.11b and 802.11g primarily operate on the 2.4 GHz frequency, while 802.11n can operate on both the 2.4 GHz and 5 GHz bands, but the question specifically asks for a standard that solely operates on 5 GHz. Therefore, 802.11a is the correct answer for this inquiry regarding the 5 GHz frequency operation.