- A
The authentication policy should be set to require MFA for all users; change the policy action to 'require MFA'.
Why wrong: Incorrect: The authentication policy already triggers the authentication sequence; the issue is that MFA is not being enforced.
- B
The authentication sequence should be reversed to 'LDAP, PingID'.
Why wrong: Incorrect: Reversing the sequence would attempt LDAP first, then PingID, which would still not enforce MFA if LDAP succeeds.
- C
The PingID server certificate is not trusted; import the CA certificate.
Why wrong: Incorrect: The PingID service is reachable, so certificate trust is not the likely issue.
- D
The PingID agent is configured to allow fallback to LDAP on authentication failure; disable fallback in the PingID agent settings.
Correct: If PingID allows fallback, the firewall will proceed to LDAP without MFA.
Quick Answer
The answer is that the PingID agent is configured to allow fallback to LDAP on authentication failure, which must be disabled to enforce MFA. This occurs because when PingID MFA fallback to LDAP is enabled in the PingID agent settings, the agent silently bypasses the MFA challenge if PingID encounters any failure or timeout, completing authentication via LDAP only—exactly matching the log entry showing 'LDAP' as the method. On the PCNSE exam, this scenario tests your understanding of how third-party MFA integrations interact with Palo Alto Networks authentication policies; a common trap is assuming the firewall controls the fallback behavior when it is actually the PingID agent that dictates the fallback logic. Remember that the firewall’s Authentication Profile may be correct, but the PingID agent’s fallback setting overrides the sequence. A useful memory tip: "Agent decides the fallback, not the firewall—check the PingID agent first."
PCNSE Practice Question: Securing Users and Applications with Authentication
This PCNSE practice question tests your understanding of securing users and applications with authentication. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses a Palo Alto Networks firewall with Authentication Policy to enforce MFA for external users accessing a web application via GlobalProtect. The authentication sequence is set to 'PingID, LDAP'. Recently, users report that after entering their LDAP credentials, they are not prompted for PingID MFA and are allowed access immediately. The firewall logs show that the authentication policy is hit and the authentication method used is 'LDAP' only. The PingID service is reachable from the firewall. The administrator checks the Authentication Profile and sees that PingID is configured correctly. What is the most likely cause of this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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 PingID agent is configured to allow fallback to LDAP on authentication failure; disable fallback in the PingID agent settings.
The correct answer is D because the PingID agent can be configured to fall back to LDAP authentication when PingID MFA fails or is unreachable. Even though the firewall can reach the PingID service, if the PingID agent itself is set to allow fallback on authentication failure, it will silently skip the MFA challenge and complete authentication via LDAP only, matching the log entry showing 'LDAP' as the authentication method.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The authentication policy should be set to require MFA for all users; change the policy action to 'require MFA'.
Why it's wrong here
Incorrect: The authentication policy already triggers the authentication sequence; the issue is that MFA is not being enforced.
- ✗
The authentication sequence should be reversed to 'LDAP, PingID'.
Why it's wrong here
Incorrect: Reversing the sequence would attempt LDAP first, then PingID, which would still not enforce MFA if LDAP succeeds.
- ✗
The PingID server certificate is not trusted; import the CA certificate.
Why it's wrong here
Incorrect: The PingID service is reachable, so certificate trust is not the likely issue.
- ✓
The PingID agent is configured to allow fallback to LDAP on authentication failure; disable fallback in the PingID agent settings.
Why this is correct
Correct: If PingID allows fallback, the firewall will proceed to LDAP without MFA.
Clue confirmation
The clue words "most likely", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume MFA bypass is always due to firewall misconfiguration (like sequence order or certificate issues), when in reality the PingID agent's fallback behavior can silently skip MFA even when the firewall and network connectivity are correctly configured.
Detailed technical explanation
How to think about this question
The PingID agent acts as a RADIUS proxy between the firewall and the PingID cloud service. When the agent is configured with 'allow fallback to LDAP', it will attempt PingID MFA first, but if the MFA request times out or fails (e.g., due to network latency or user not responding), the agent automatically reverts to LDAP authentication without notifying the firewall. This behavior is controlled by the PingID agent's 'fallback_on_failure' setting, which is separate from the firewall's authentication profile configuration.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the PCNSE exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Securing Users and Applications with Authentication — study guide chapter
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FAQ
Questions learners often ask
What does this PCNSE question test?
Securing Users and Applications with Authentication — This question tests Securing Users and Applications with Authentication — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The PingID agent is configured to allow fallback to LDAP on authentication failure; disable fallback in the PingID agent settings. — The correct answer is D because the PingID agent can be configured to fall back to LDAP authentication when PingID MFA fails or is unreachable. Even though the firewall can reach the PingID service, if the PingID agent itself is set to allow fallback on authentication failure, it will silently skip the MFA challenge and complete authentication via LDAP only, matching the log entry showing 'LDAP' as the authentication method.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "immediately / without restart". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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