Information Technology Specialist (ITS) Cybersecurity Practice Exam

To implement an 802.1x network access control solution, which type of server is essential?

1. DHCP server

2. RADIUS server

3. DNS server

4. Proxy server

The correct answer is: RADIUS server

Implementing an 802.1X network access control solution requires a RADIUS server because this server plays a critical role in authenticating and authorizing devices attempting to connect to the network. 802.1X is a network protocol that provides an effective framework for controlling access to a wired or wireless network, utilizing port-based network access control. When a device attempts to connect to the network, it sends authentication information to the access switch or point. This information is then forwarded to the RADIUS server, which verifies the credentials against a user database. If the authentication is successful, the RADIUS server sends a response allowing network access; if not, access is denied. This process includes not just identification but also the management of user sessions and the enforcement of policies regarding network access, making the RADIUS server integral to the 802.1X framework. In contrast, a DHCP server is responsible for dynamically assigning IP addresses to devices on the network, a function not directly related to access control. A DNS server translates domain names into IP addresses, which also does not pertain to authentication and access management. Similarly, a proxy server acts as an intermediary for requests from clients seeking resources from other servers, and while it can provide additional security features, it