The answer is that the remote users' computers are not domain-joined. Kerberos authentication requires the client to be a member of the Active Directory domain to obtain a ticket-granting ticket (TGT) from the Key Distribution Center (KDC); without domain membership, remote users cannot acquire or present Kerberos tickets, causing GlobalProtect authentication to fail. On the PCNSE exam, this scenario tests your understanding of how Kerberos differs from other authentication methods like LDAP or SAML, which do not mandate domain join—a common trap is assuming a valid username and password alone suffice. Remember that Kerberos is a ticket-based protocol, not a simple password challenge, so the client must prove domain identity first. Memory tip: "No domain, no ticket, no Kerberos."
PCNSE Secure Access and VPN Practice Question
This PCNSE practice question tests your understanding of secure access and vpn. 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.
An administrator configures a GlobalProtect portal with an authentication profile that uses Kerberos. Users report they cannot connect from remote locations. What is the most likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The remote users' computers are not domain-joined.
Kerberos authentication relies on the client being a member of the Active Directory domain to obtain a ticket-granting ticket (TGT) from the Key Distribution Center (KDC). Remote users whose computers are not domain-joined cannot acquire or present Kerberos tickets, causing authentication to fail. This is the most common reason for connection failures when Kerberos is used for GlobalProtect portal authentication.
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 remote users' computers are not domain-joined.
Why this is correct
Kerberos authentication requires the client to be domain-joined to obtain a ticket.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The external gateway is not configured for Kerberos authentication.
Why it's wrong here
The authentication profile is configured on the portal, not the gateway.
✗
The authentication profile is not configured on the gateway.
Why it's wrong here
Kerberos authentication is only needed on the portal; the gateway uses the portal's authentication token.
✗
The GlobalProtect gateway certificate is not trusted by the client.
Why it's wrong here
Certificate trust issues would cause a different error (e.g., untrusted CA), not a Kerberos authentication failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume Kerberos authentication can be used for external gateways or that the issue is certificate-related, but the key is understanding that Kerberos requires domain membership and cannot work for non-domain-joined remote clients.
Detailed technical explanation
How to think about this question
Kerberos authentication in GlobalProtect works by the client sending an HTTP Negotiate header with a Kerberos service ticket to the portal, which the portal validates against the domain controller. If the client is not domain-joined, it cannot obtain a TGT or service ticket, so the authentication attempt fails immediately. In a real-world scenario, remote users on personal or non-domain devices would need an alternative authentication method (e.g., SAML or certificate-based) to connect successfully.
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.
Secure Access and VPN — This question tests Secure Access and VPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The remote users' computers are not domain-joined. — Kerberos authentication relies on the client being a member of the Active Directory domain to obtain a ticket-granting ticket (TGT) from the Key Distribution Center (KDC). Remote users whose computers are not domain-joined cannot acquire or present Kerberos tickets, causing authentication to fail. This is the most common reason for connection failures when Kerberos is used for GlobalProtect portal authentication.
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". 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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Question Discussion
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