PCNSE Practice Question: Securing Users and Applications with Authentication
Exhibit
Refer to the exhibit. > show running security-rule rule "web-auth" Source zone: trust Destination zone: untrust Source user: any Destination user: any Application: web-browsing Service: application-default Action: allow Authentication enforcement: authenticate Authentication profile: saml-profile
A firewall administrator configured the security rule shown in the exhibit to enforce SAML authentication for web-browsing traffic from the trust zone to the untrust zone. However, users are not prompted to authenticate. What is the most likely cause?
⚠ Common exam trap
Candidates often assume the issue is with the rule configuration (e.g., application or source user) rather than the underlying identity provider setup, which is a separate but critical component for SAML to function.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The authentication profile 'saml-profile' is not associated with a valid SAML identity provider object.
SAML authentication requires a valid identity provider (IdP) object configured on the firewall. The authentication profile 'saml-profile' must reference an IdP object that contains the correct SAML metadata (e.g., entity ID, SSO URL, certificate). If the IdP object is missing, misconfigured, or not associated with the profile, the firewall cannot initiate the SAML flow, so users are never redirected for authentication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SSL decryption must be enabled on the firewall for SAML to function.
Why it's wrong here
SAML authentication works over HTTPS, but SSL decryption is not required; the firewall can proxy the authentication flow without decryption.
- ✗
The application must be changed from 'web-browsing' to 'ssl'.
Why it's wrong here
'web-browsing' includes HTTPS traffic, which is the typical transport for SAML. Using 'ssl' might miss other web traffic and is not necessary.
- ✗
A previous security rule allows web-browsing traffic without authentication enforcement.
Why it's wrong here
If a previous rule allows the traffic without enforcement, it could bypass authentication, but the exhibit does not show any previous rule, and the most common misconfiguration is the authentication profile itself.
- ✗
The source user must be set to 'known-user' to trigger authentication.
Why it's wrong here
Source user 'any' will still trigger authentication for unknown users because the firewall will attempt to identify and authenticate them.
- ✓
The authentication profile 'saml-profile' is not associated with a valid SAML identity provider object.
Why this is correct
An authentication profile used for SAML must reference a a properly configured SAML identity provider object. Without it, the firewall cannot perform SAML authentication.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSE practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSE exam.