20+ practice questions focused on Decryption and Monitoring — one of the most tested topics on the Palo Alto Networks Certified Network Security Administrator PCNSA exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Decryption and Monitoring PracticeA security engineer notices that HTTPS traffic to a critical business application is being decrypted and re-encrypted, causing performance issues. The application uses a certificate from a public CA. The engineer wants to minimize decryption overhead while still inspecting for threats. Which decryption policy configuration best achieves this?
Explanation: Option C is correct because setting the action to 'No Decrypt' with a Forward Trust Certificate and Forward Untrust Certificate enabled, along with certificate status check, allows the firewall to validate the server certificate and forward the original encrypted traffic without decrypting it. This minimizes decryption overhead while still performing certificate inspection to detect threats like revoked or untrusted certificates, which is ideal for traffic from a public CA where decryption is not required for threat detection.
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?
Explanation: 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.
A network administrator wants to monitor traffic that is not decrypted due to a 'No Decrypt' policy rule. Which log type would show that decryption was bypassed?
Explanation: Tunnel Inspection logs are specifically designed to record traffic that bypasses decryption due to a 'No Decrypt' policy rule. When a decryption policy is set to 'No Decrypt', the firewall does not inspect the encrypted payload, but Tunnel Inspection logs capture metadata about the bypassed session, including the reason for bypass. This allows administrators to monitor and audit traffic that was not decrypted, ensuring visibility into policy exceptions.
A company has a decryption policy that decrypts all outbound SSL traffic. Recently, users accessing a partner website receive a certificate warning. The partner uses a self-signed certificate. The firewall is configured with a CA-signed certificate for decryption. Which action should the firewall take?
Explanation: When a firewall is configured for SSL decryption with a CA-signed certificate, it acts as a man-in-the-middle. For outbound traffic to a server using a self-signed certificate, the firewall cannot validate the server's certificate against a trusted CA. It will present the server's self-signed certificate to the client, which the client's browser does not trust, causing a certificate warning.
Which monitoring tool in Palo Alto Networks firewall provides real-time visibility into decryption statistics, such as the number of sessions decrypted and certificate errors?
Explanation: The Dashboard in Palo Alto Networks firewall provides real-time visibility into decryption statistics, including the number of sessions decrypted, certificate errors, and decryption failures. This is accessible via the 'Decryption' widget on the Dashboard, which aggregates live data from the decryption engine without requiring log queries or report generation.
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Practice all Decryption and Monitoring questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Decryption and Monitoring. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Decryption and Monitoring questions on the PCNSA frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Decryption and Monitoring is tested as part of the Palo Alto Networks Certified Network Security Administrator PCNSA blueprint. Practicing with targeted Decryption and Monitoring questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Decryption and Monitoring is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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