Certificate and 802.1x

Our computers are using 802.1x .
I noticed the PCs' cert store has two certificates. Previous tech might have tested the system with multiple cert and left as it is.
How do I find out which certificate is being used for authentication?
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Michael B. SmithExchange & Active Directory ExpertCommented:
What are the two certs? I wouldn't arbitrarily assume that either certificate isn't being used for SOMETHING. The "Certificate Template" and "Intended Purposes" column in the certificates MMC can guide you to the generic use of a certificate. The Key Usage and Enhanced Key Usage attributes on each certificate can give you specific uses of a certificate (on the Details tab of a certificate's property page).

If you are using EAP-TLS or PEAP-TLS, there will probably be THREE certificates: a user certificate, a device certificate, and a root certificate.

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sara2000Author Commented:
Users PC has computer and domain controller certs.
The NPS has domain controller and Kerberos authentication.
Both kerberos and domain controller have same purpose such as server', client authentication.
I guess the domain controller is being used since it has at both PC and the NPS. I would like to know how to find which cert is being used.
Michael B. SmithExchange & Active Directory ExpertCommented:
All of them.
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