WPA2-Enterprise with 802.1X authentication provides a secure method to control network access. It utilizes Extensible Authentication Protocol (EAP) to facilitate the use of different authentication methods, including the use of certificates and credentials. WEP is outdated and insecure; thus, it should not be used. WPA2-Personal only uses a preshared key, which is not as secure as WPA2-Enterprise with 802.1X, especially in an enterprise scenario. A captive portal is typically used in public networks, such as coffee shops or airports, to present a web page for authentication and does not inherently require certificates or enterprise-grade authentication methods.