Dell PowerConnect W Clearpass 100 Software 3.9 Deployment Guide - Page 25

Figure 3 Interactions involved in guest access ClearPass Guest is part of your network's core infrastructure and manages guest access to the network. NAS devices, such as wireless access points and wired switches on the edge of the network, use the RADIUS protocol to ask ClearPass Guest to authenticate the username and password provided by a guest logging in to the network. If authentication is successful, the guest is then authorized to access the network. Authorized access uses the concept of roles. Each visitor is assigned a role, which consists of a group of RADIUS attributes. These attributes are used to control every aspect of the guest's network session, effectively defining a security policy that controls what the guest is permitted to do on the network. Vendorspecific attributes may be used to configure the finer details of the NAS security policy. The network usage of authorized guests is monitored by the NAS and reported in summary form to ClearPass Guest using RADIUS accounting, which allows administrators to generate network usage reports. AAA Framework ClearPass Guest is built on the industry standard AAA framework, which consists of authentication, authorization, and accounting components. The following figure shows how the different components of this framework are employed in a guest access scenario. See Figure 4. ClearPass Guest 3.9 | Deployment Guide Management Overview | 25