- A
The policy is missing the source zone; the traffic is being blocked by an implicit deny rule before any policy match.
If the source zone is not correctly configured, the policy won't match, and the traffic will hit the implicit deny rule, resulting in no log entries.
- B
There is a routing issue preventing return traffic from reaching the firewall.
Why wrong: A routing issue would typically cause sessions to be created but with no return traffic, resulting in partially logged sessions, not zero sessions.
- C
The policy has the wrong destination zone; the server is actually in the Internal zone.
Why wrong: If the destination zone were wrong, the traffic might match a different policy, but the absence of any sessions suggests no policy match at all.
- D
The firewall is not configured to perform SSL decryption; thus HTTPS traffic is being blocked.
Why wrong: SSL decryption is optional; the firewall can allow HTTPS traffic without decryption if the policy permits the application and service.
PCNSA Core Concepts Practice Question
This PCNSA practice question tests your understanding of core concepts. 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 has a Palo Alto Networks firewall in a data center, connecting internal users (zone: Internal) to the internet (zone: Untrust). Recently, users report that they cannot access the corporate HR portal hosted on a server in the DMZ (zone: DMZ, IP 10.10.10.10) using HTTPS. The firewall has a security policy that allows traffic from Internal to DMZ with application web-browsing and service https-ssl. The policy is in place and committed. The administrator verifies that the web server is running and reachable from within the DMZ. From the firewall, a ping from the management interface to the server is successful. However, when a user tries to access https://10.10.10.10, the connection times out. Traffic logs show no sessions logged for that traffic. 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 policy is missing the source zone; the traffic is being blocked by an implicit deny rule before any policy match.
Option A is correct. Since there are no sessions in the traffic log, the traffic is being dropped by the implicit deny rule, meaning no security policy matched. The most likely reason is that the policy's source zone is not set to Internal; if it were set to another zone (e.g., Untrust), the traffic from Internal would not match. Option B would likely produce sessions if matched by another policy. Option C would show sessions but no return traffic. Option D is incorrect because SSL decryption is not required for HTTPS to be allowed through the firewall.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 policy is missing the source zone; the traffic is being blocked by an implicit deny rule before any policy match.
Why this is correct
If the source zone is not correctly configured, the policy won't match, and the traffic will hit the implicit deny rule, resulting in no log entries.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
There is a routing issue preventing return traffic from reaching the firewall.
Why it's wrong here
A routing issue would typically cause sessions to be created but with no return traffic, resulting in partially logged sessions, not zero sessions.
- ✗
The policy has the wrong destination zone; the server is actually in the Internal zone.
Why it's wrong here
If the destination zone were wrong, the traffic might match a different policy, but the absence of any sessions suggests no policy match at all.
- ✗
The firewall is not configured to perform SSL decryption; thus HTTPS traffic is being blocked.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSA NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Core Concepts — This question tests Core Concepts — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The policy is missing the source zone; the traffic is being blocked by an implicit deny rule before any policy match. — Option A is correct. Since there are no sessions in the traffic log, the traffic is being dropped by the implicit deny rule, meaning no security policy matched. The most likely reason is that the policy's source zone is not set to Internal; if it were set to another zone (e.g., Untrust), the traffic from Internal would not match. Option B would likely produce sessions if matched by another policy. Option C would show sessions but no return traffic. Option D is incorrect because SSL decryption is not required for HTTPS to be allowed through the firewall.
What should I do if I get this PCNSA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSA NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This PCNSA 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 PCNSA exam.
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