D-Link DGS-1520 User Manual - Page 418

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide source. The Client will request access to the LAN and or Switch through EAPOL packets and, in turn will respond to requests from the Switch. Figure 9-8 The Client Authentication Process Utilizing the three roles stated above, the 802.1X protocol provides a stable and secure way of authorizing and authenticating users attempting to access the network. Only EAPOL traffic is allowed to pass through the specified port before a successful authentication is made. This port is "locked" until the point when a Client with the correct username and password (and MAC address if 802.1X is enabled by MAC address) is granted access and therefore successfully "unlocks" the port. Once the port is unlocked, normal traffic is allowed to pass through the port. The following figure displays a detailed explanation of how the authentication process is completed between the three roles stated above. Figure 9-9 The 802.1X Authentication Process The D-Link implementation of 802.1X allows network administrators to choose between two types of Access Control used on the Switch, which are: • Port-based Access Control - This method requires only one user to be authenticated per port by a remote RADIUS server to allow the remaining users on the same port access to the network. • Host-based Access Control - Using this method, the Switch will automatically learn up to a maximum of 4096 MAC addresses by port and set them in a list. Each MAC address must be authenticated by the Switch using a remote RADIUS server before being allowed access to the Network. 408