There are several types of wireless authentication modes, including:

• Open Authentication (no real security)
• WEP (Wired Equivalent Privacy, now obsolete)
• WPA (Wi-Fi Protected Access)
• WPA2 (improved WPA with stronger security)
• WPA3 (latest and most secure WPA version)
• EAP (Extensible Authentication Protocol) variants such as EAP-FAST, EAP-TLS, PEAP used in enterprise settings
• Cisco proprietary methods like LEAP (lightweight EAP)
• Pre-Shared Key (PSK) based authentication (often used in WPA/WPA2 Personal)
• Captive Portal for public wifi
• Enterprise authentication using RADIUS servers with 802.1X and EAP methods
• Multi-Factor Authentication (MFA) and Single Sign-On (SSO) as advanced authentication mechanisms

In summary, wireless authentication modes vary from simple open or pre-shared key models to complex enterprise protocols with multiple EAP types and multi- factor authentication schemes. The choice depends on security needs, from home use to enterprise environments.