802.11 ax is a wireless networking protocol that utilizes the 5.0GHz frequency and has the best speed and reception among the options given. 802.11 ax offers higher data rates, lower latency, increased capacity, and improved power efficiency than previous protocols. It is also known as Wi-Fi 6 or High Efficiency Wireless (HEW). 802.11a also uses the 5.0GHz frequency, but it is an older protocol that has lower speed and reception than 802.11 ax. 802.11b/g/n use the 2.4GHz frequency, which is more crowded and prone to interference than the 5.0GHz frequency. 802.11n can use both frequencies, but it is also slower and less efficient than 802.11 ax. Reference: https://www.comptia.org/training/books/a-core-1-220-1101-study-guide (page 82)
802.11a: Legacy 5 GHz Wi-Fi
802.11a supported the 5 GHz band and a theoretical maximum speed of 54 Mbps. In the early 2000s, many business/enterprise wireless devices used 802.11a Wi-Fi radios. The 5GHz bandwidths allowed for higher speeds than 802.11b and 2.4 GHz
802.11ax can work in both 2.4GHz and 5GHz bands.
The rate on AX6000 claims nominal rate of 1,148 Mbps on 2.4GHz radio and 4,804 Mbps over 5GHz.
I don't know about you, but 4,804Mbps(802.11ax) looks way faster than 54Mbps(802.11a).
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