Hi GridironsHero,
We may select EAP(PEAP)-TLS method to authenticate 802.1X connection.
EAP-TLS(PEAP-TLS) requires both clients certificate and server certificate. You may click the following link for detailed information about certificate-based authentication method:
Certificates and NPS:
https://technet.microsoft.com/en-us/library/cc772401(v=ws.10).aspx
To configure EAP-TLS authentication, you may click this article for detailed information；
Use the 802.1X Wizard to Configure NPS Network Policies：
https://technet.microsoft.com/en-us/library/dd283091(v=ws.10).aspx
Best Regards,
Anne
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