Security Enhancement on Network Access Control (NAC)
Jeanlin Kalonji, Sayeed Sajal · 2025
Network Access Control or 802.1X specifies authentication requirements for any user or device attempting to connect to a LAN or WLAN. Network Access Control (NAC) is a critical security technique that regulates and authenticates network access. The IEEE 802.1X standard is a commonly used framework for implementing network access control (NAC) in wired and wireless network environments. The purpose of 802.1X is to implement stringent access control standards, ensuring that only authorized devices and users can connect to the network. This is accomplished by an authentication procedure that includes three main entities: the supplicant, the authenticator, and the authentication server. The 802.1X procedure starts with the supplicant attempting to connect to the network, followed by the authenticator blocking all data traffic until successful authentication happens. The authentication request is forwarded by the authenticator to the chosen authentication server, which checks the supplicant’s credentials using various authentication methods, such as the EAP (Extensible Authentication Protocol) versions. It provides a strong security layer that protects against unwanted access and any security breaches. It offers centralized user administration using RADIUS servers, allowing administrators to govern access policies from a single location. Finally, 802.1X is adaptable and interoperable, allowing it to function with a wide range of devices and network infrastructures.