What technology can be implemented to enhance the security posture of a WLAN when multiple APs are utilized?

Implementing 802.1X authentication significantly enhances the security posture of a WLAN with multiple access points (APs). This technology employs a robust framework for network access control, providing a means for devices to authenticate themselves securely before gaining access to the network.

With 802.1X, a RADIUS (Remote Authentication Dial-In User Service) server handles authentication requests, ensuring that only authorized devices can connect to the network. This approach is particularly effective in environments with multiple APs, as it creates a centralized authentication mechanism that helps maintain consistent security policies across the entire WLAN. It supports more secure authentication methods such as EAP (Extensible Authentication Protocol), allowing for different credential types like passwords, certificates, or tokens.

The other options, while offering some basic security features, do not provide the same level of robust authentication and control that 802.1X does. For instance, WEP encryption is outdated and easily compromised, MAC address filtering can be bypassed by spoofing, and SSID broadcast suppression can enhance privacy but does not address authentication issues. Therefore, 802.1X stands out as the most effective choice for strengthening WLAN security, particularly in a multi-AP environment.