WiFi uses a different protocol than classic Ethernet, with "Collision Avoidance" instead of "Collision Detection". The reason is that one WiFi station cannot kn

WiFi uses a different protocol than classic Ethernet, with "Collision Avoidance" instead of "Collision Detection". The reason is that one WiFi station cannot know what sources of radio interference exist at the other stations of a network, because it may hear only a part of them at its location. So all remnants of the original Ethernet could be removed from wired Ethernet, which does not need layer 2 protocols, while keeping adequate layer 2 protocols for wireless communications. Besides WiFi, there are also long-range point-to-point wireless links, where directive antennas are used at both ends. For these, there is no difference from wired links, so they do not need layer 2 protocols.