If your RADIUS clients (authenticating switches and wireless access points) support VLANs, you can configure NPS to supply ...

If your RADIUS clients (authenticating switches and wireless access points) support VLANs, you can configure NPS to supply RADIUS clients with VLAN information. This allows the RADIUS clients to route traffic to the appropriate network based on instructions it receives from NPS.  If you do not use VLANs or you want to configure them later, click Next.