This PCNSA practice question tests your understanding of decryption and monitoring. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 implements SSL Forward Proxy decryption. Users report that some internal applications fail to load after deployment. The firewall is configured with a CA-signed certificate for decryption. What is the most likely cause of the application failures?
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 firewall's CA certificate is not installed in the trusted root store on user endpoints.
Option C is correct because SSL Forward Proxy decryption requires the firewall's CA certificate to be trusted by client endpoints. When the firewall generates a new certificate for the internal application's server, the client must trust the firewall's CA to avoid certificate validation errors. Without the CA in the trusted root store, browsers and applications will reject the connection, causing failures for internal applications that rely on SSL/TLS.
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 decryption policy uses 'No Decrypt' for the internal application's URL category.
Why it's wrong here
That would bypass decryption, not cause failures.
✗
The decryption policy is set to 'Decrypt' for all traffic, causing performance bottlenecks.
Why it's wrong here
Performance issues cause slowness, not outright failure.
✓
The firewall's CA certificate is not installed in the trusted root store on user endpoints.
Why this is correct
Without trust, browsers show certificate errors and block the connection.
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 firewall is configured to decrypt traffic from the internal zone, but not the external zone.
Why it's wrong here
Internal applications are typically in the internal zone, so decryption should apply.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the misconception that decryption failures are caused by policy misconfigurations or performance issues, rather than the fundamental requirement of installing the firewall's CA certificate on all client devices.
Detailed technical explanation
How to think about this question
In SSL Forward Proxy, the firewall intercepts the ClientHello, then initiates a new TLS handshake with the server using the server's real certificate. The firewall then presents a dynamically generated certificate signed by its own CA to the client. If the client does not trust this CA (i.e., it is not in the Trusted Root Certification Authorities store), the client will display a certificate error or abort the connection, as per RFC 5280 path validation. This is distinct from SSL Inbound Inspection, where the firewall presents the server's actual certificate.
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 PCNSA 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.
Decryption and Monitoring — This question tests Decryption and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The firewall's CA certificate is not installed in the trusted root store on user endpoints. — Option C is correct because SSL Forward Proxy decryption requires the firewall's CA certificate to be trusted by client endpoints. When the firewall generates a new certificate for the internal application's server, the client must trust the firewall's CA to avoid certificate validation errors. Without the CA in the trusted root store, browsers and applications will reject the connection, causing failures for internal applications that rely on SSL/TLS.
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: "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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