The answer is to create a decryption exclusion rule for the specific cloud application by source or URL category. This is correct because certificate pinning hardcodes the expected server certificate into the application, so when the Palo Alto firewall performs SSL decryption and re-encrypts the traffic with its own certificate, the pinned certificate mismatch causes the application to break. A decryption exclusion rule bypasses decryption for that traffic, allowing the original certificate to reach the client while the firewall still decrypts all other outbound HTTPS traffic for threat inspection. On the PCNSA exam, this scenario tests your understanding of how decryption policies interact with application behavior, and a common trap is to disable decryption entirely or add a security rule, which would either weaken security or fail to address the decryption issue. Remember the mnemonic “Pin to Skip” — when an app pins its certificate, you must skip decryption for that specific traffic.
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. 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 small business uses a single PA-220 firewall for internet access and has three internal zones: Trust, DMZ, and Guest. Users in the Trust zone report intermittent connectivity to a public cloud application. The firewall administrator checks the traffic logs and sees that sessions to the cloud application show "Application: ssl" and "Action: allow". The administrator suspects the issue might be related to decryption. The firewall currently has a decryption policy that decrypts all outbound HTTPS traffic for threat inspection. The cloud application uses certificate pinning and breaks when decrypted. What is the best solution to allow this application to function while still decrypting other traffic?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a decryption exclusion rule for the specific cloud application by source or URL category.
Option B is correct because creating a decryption exclusion rule for the specific cloud application (by source IP, URL category, or destination) allows the firewall to bypass decryption for that traffic while continuing to decrypt all other outbound HTTPS traffic. This resolves the certificate pinning issue without compromising security for other traffic. Decryption exclusion rules are a standard feature in PAN-OS for handling applications that break under decryption.
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.
✗
Upgrade the firewall to a model that supports certificate key protection.
Why it's wrong here
Certificate key protection does not address certificate pinning issues.
✓
Create a decryption exclusion rule for the specific cloud application by source or URL category.
Why this is correct
Exclusion rules allow bypassing decryption for specific traffic.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable SSL decryption entirely.
Why it's wrong here
This would remove protection for all other traffic.
✗
Change the decryption policy to decrypt only inbound traffic.
Why it's wrong here
This would not solve the outbound issue and leaves outbound traffic unprotected.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think disabling decryption entirely is the simplest fix, but they overlook the need to maintain security for other traffic, or they mistakenly believe hardware upgrades can solve application-layer compatibility issues like certificate pinning.
Detailed technical explanation
How to think about this question
Certificate pinning hardcodes the expected server certificate or public key in the application, causing it to reject the firewall's re-signed certificate during decryption. PAN-OS decryption policies use ordered rules with match criteria (source zone, destination, URL category, etc.) to selectively bypass decryption; the firewall then forwards the original encrypted traffic untouched. In real-world scenarios, administrators often combine URL category-based exclusions with custom URL objects for precise control.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a decryption exclusion rule for the specific cloud application by source or URL category. — Option B is correct because creating a decryption exclusion rule for the specific cloud application (by source IP, URL category, or destination) allows the firewall to bypass decryption for that traffic while continuing to decrypt all other outbound HTTPS traffic. This resolves the certificate pinning issue without compromising security for other traffic. Decryption exclusion rules are a standard feature in PAN-OS for handling applications that break under decryption.
What should I do if I get this PCNSA 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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