D-Link DGS-3324SR Product Manual - Page 150

xStack DGS/DXS-3300 Series Layer 3 Stackable Gigabit Ethernet Switch User Manual Client The Client is simply the endstation that wishes to gain access to the LAN or switch services. All endstations must be running software that is compliant with the 802.1x protocol. For users running Windows XP, that software is included within the operating system. All other users are required to attain 802.1x client software from an outside 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 6- 98. 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 unlocked, normal traffic is allowed to pass through the port. The following figure displays a more detailed explanation of how the authentication process is completed between the three roles stated above. Figure 6- 99. 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: 1. 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. 2. MAC-Based Access Control - Using this method, the Switch will automatically learn up to three 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. 135