QuestionQ46

Analyze

A company wants its AOS-CX switches to obtain certificates from ClearPass Onboard and use those certificates to implement RadSec with ClearPass Policy Manager (CPPM).

ClearPass Onboard has a CA with EST enabled and this EST URL: https://cp1.acnsxtest.com/.well-known/est/ca:2

ClearPass Guest has an account whose username is "[email protected]." (Assume CPPM also has a valid service to authenticate users who access the EST application.)

CPPM has a network-device account for the switches with RadSec enabled. The RadSec settings validate by CN or SAN using this regex: switchcorp123

ClearPass has these certificates:

  • HTTPS certificate signed by DigiCert
  • RadSec certificate signed by DigiCert
  • RADIUS/EAP certificate signed by MyDomainCA

This configuration is on the AOS-CX switches:

crypto pki est-profile est1  
url https://clearpass1.acnsxtest.com/.well-known/est/ca:2  
username switchcorp123 password plaintext %FY212h&zaTk  
vrf default  
exit  
crypto pki certificate cert1  
subject switchcorp123  
enroll est-profile onboard  
crypto pki application radsec-client certificate cert1  

The switches’ TA-profile list includes DigiCert.

Assume you have obtained the correct password associated with the indicated username. What error or errors are present?

  • A The URL in the EST profile is incorrect, and the switch does not trust a necessary CA.
  • B Only the username in the EST profile is incorrect.
  • C Only the URL in the EST profile is incorrect.
  • D The URL in the EST profile is incorrect, and the common name in the EST profile is incorrect.
Explanation

The EST profile must use the actual EST server URL, so https://clearpass1.acnsxtest.com/.well-known/est/ca:2 does not match the specified https://cp1.acnsxtest.com/.well-known/est/ca:2 endpoint. DigiCert is already trusted by the switches and signs the ClearPass HTTPS certificate, satisfying the EST server-certificate trust requirement. The switchcorp123 certificate subject also matches the configured RadSec CN/SAN validation regex.

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