EAPOL protocol version - indicates which 802.1X specification is in use
Version 1 - Legacy 802.1X (wired networks, early Wi-Fi, WPA)
Version 2 - WPA / WPA2 / WPA3 (most common in modern Wi-Fi)
Version 3 - 802.1X-2020 (rare, niche use cases, backward-compatible)
EAPOL protocol version - indicates which 802.1X specification is in use