- A
The tunnel interface is not in a virtual router.
Why wrong: The tunnel interface is automatically placed in the virtual router, so this is unlikely.
- B
The firewall does not have a route to the virtual IP pool.
Without a route for the virtual IP pool, the firewall cannot route return traffic to the tunnel interface.
- C
The security policy does not allow traffic from the VPN zone.
Why wrong: While a security rule is required, the symptom of no access at all suggests a routing issue, not just a policy block.
- D
The IP pool for the VPN client is exhausted.
Why wrong: If the client receives an IP, the pool is not exhausted.
Question 344 of 516
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.
A firewall is configured with a GlobalProtect gateway that uses an IPSec tunnel. Remote users can connect but cannot access any resources. The administrator verifies that the tunnel is established and the client receives an IP address. 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 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 firewall does not have a route to the virtual IP pool.
When a GlobalProtect gateway uses an IPSec tunnel, the client receives an IP address from a virtual IP pool assigned to the tunnel interface. If the firewall lacks a route to that virtual IP pool, return traffic from internal resources cannot reach the client, even though the tunnel is established and the client has an IP. This is a common misconfiguration because the tunnel interface itself does not automatically inject a route for the pool into the virtual router.
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 tunnel interface is not in a virtual router.
Why it's wrong here
The tunnel interface is automatically placed in the virtual router, so this is unlikely.
- ✓
The firewall does not have a route to the virtual IP pool.
Why this is correct
Without a route for the virtual IP pool, the firewall cannot route return traffic to the tunnel interface.
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 security policy does not allow traffic from the VPN zone.
Why it's wrong here
While a security rule is required, the symptom of no access at all suggests a routing issue, not just a policy block.
- ✗
The IP pool for the VPN client is exhausted.
Why it's wrong here
If the client receives an IP, the pool is not exhausted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a successful tunnel establishment and IP assignment guarantee connectivity, overlooking the separate requirement for a return route to the virtual IP pool.
Detailed technical explanation
How to think about this question
The virtual IP pool is a range of addresses assigned to the GlobalProtect client, and the firewall must have a route in the virtual router pointing to the tunnel interface for that pool. Without this route, the firewall performs a route lookup for the client's IP and finds no match, causing it to drop the packet or send it out the wrong interface. In real-world scenarios, this often happens when the pool is on a different subnet than the tunnel interface's IP, and the administrator forgets to add a static route or enable dynamic routing for the pool.
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.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCNSE question test?
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 firewall does not have a route to the virtual IP pool. — When a GlobalProtect gateway uses an IPSec tunnel, the client receives an IP address from a virtual IP pool assigned to the tunnel interface. If the firewall lacks a route to that virtual IP pool, return traffic from internal resources cannot reach the client, even though the tunnel is established and the client has an IP. This is a common misconfiguration because the tunnel interface itself does not automatically inject a route for the pool into the virtual router.
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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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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