Home » HP » HPE6-A07 » What is the purpose of the pre-auth check during guest authentication?
What is the purpose of the pre-auth check during guest authentication?
A. for the NAD device to do an internal authentication check before sending the credentials to ClearPass
B. for the NAD device to check that ClearPass is active before sending it the RADIUS request
C. for ClearPass to do an internal authentication check before the NAS login happens
D. for the client device to do an internal sanity check before the NAS login occurs
E. for the client device to check that ClearPass is active before sending it the credentials
Correct Answer: C
Explanation/Reference:
The way NAS devices like wireless controllers do authentication on external captive portals only allows standard reject message handling like "authentication failed". The pre auth check allows CPPM to provide advanced error handling of a reject like "your time limit has been reached" before a user logs in. It is to do an end run around limited error handing of NAS devices on external captive portals.
Reference https://community.arubanetworks.com/t5/Security/why-use-pre-auth-check/m-p/93254
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