Below is an extract from the Web Login Page configuration in ClearPass Guest:

What is the purpose of the Pre-Auth Check?

A.
To authenticate users before they launch the Web Login Page.

B.
To authenticate users before ClearPass sends the credentials to the NAD device.

C.
To authenticate users after the NAD device sends an authentication request to
ClearPass.

D.
To replace the need for the NAD to send an authentication request to ClearPass.

E.
To re-authenticate users when they’re roaming from one NAD to another.