A network administrator is setting up wireless access points in all the conference rooms and wants to authenticate devices using PKI. Which of the following should the administrator configure?

The correct choice involves the implementation of 802.1X, which is a network access control protocol that provides a framework for authenticating devices on a network. This protocol works in conjunction with a Public Key Infrastructure (PKI) system to ensure that both users and devices are authenticated before they can access network resources, particularly in wireless environments.

By utilizing 802.1X, the network administrator can have a more secure authentication process consisting of a combination of a RADIUS (Remote Authentication Dial-In User Service) server and certificates, which are part of the PKI system. This setup allows for dynamic provisioning of keys and ensures that only authorized devices with valid certificates are granted access to the network.

Captive portals are often used for guest access in public Wi-Fi networks and do not inherently use PKI for device authentication. Pre-Shared Key (PSK) authentication is simpler and does not involve certificates, making it less secure for environments where there is a need for robust authentication mechanisms. Wi-Fi Protected Setup (WPS) simplifies the process of connecting devices to wireless networks but is also not aligned with the complexities and security features associated with PKI and certificate-based authentication. Therefore, 802.1X is the most suitable choice for securely