PCNSA Decryption and Monitoring Practice Question
A security team wants to inspect traffic to and from a critical application server. They configure an inbound decryption rule to decrypt traffic destined to the server's IP address. After deploying, they find that traffic is not being decrypted. What is the first step to troubleshoot?
⚠ Common exam trap
Palo Alto Networks often tests the misconception that certificate issues are the primary cause of decryption failures, but in Palo Alto environments, rule order and policy evaluation are the most common first-step troubleshooting focus.
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
✓
Check the decryption policy rule order and ensure it is before any no-decrypt rules.
In Palo Alto Networks firewalls, decryption policy rules are evaluated in order from top to bottom, and the first matching rule is applied. If a 'no-decrypt' rule appears before the inbound decryption rule, traffic matching the server's IP will be handled by the no-decrypt rule and will not be decrypted. Therefore, verifying rule order is the first troubleshooting step.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Confirm that the decryption profile is set to 'decrypt' and that the forward proxy option is enabled.
Why it's wrong here
Forward proxy is for outbound decryption; inbound decryption uses 'SSL Inbound Inspection' method.
- ✓
Check the decryption policy rule order and ensure it is before any no-decrypt rules.
Why this is correct
Rule order is the first thing to check; a higher-priority no-decrypt rule would cause the traffic to bypass decryption.
- ✗
Verify that the server's certificate is installed on the firewall.
Why it's wrong here
Inbound decryption requires the server's private key, not just the certificate; simply installing the cert is insufficient.
- ✗
Ensure that the firewall has a valid certificate for inbound inspection.
Why it's wrong here
Inbound inspection uses the destination server's certificate, not a firewall certificate.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.