NPS on DHCP for multiple-vlans

Hello,

On our network

172.16.125.0/24 - User Segment

172.16.128.0/24 - Server segment (DHCP/NPS servers)

We setup our DHCP and NPS to 128 network and clients are 125 network. How can the NPS work in such a way the clients can authenticate to the NPS server

I found this solution https://technet.microsoft.com/en-us/library/cc772124(v=ws.10).aspx

But need you advise if I have to configure A RADIUS Server and do I have to configure our Switches as well?

Regards,

Miguel