The answer is to install the firewall’s CA certificate on all client devices and to exclude internal traffic from decryption. These two practices are essential for SSL forward proxy decryption best practices because the firewall must be able to re-sign intercepted sessions with a trusted certificate; without the CA certificate installed on clients, browsers will display untrusted certificate warnings and block traffic. Excluding internal traffic prevents the firewall from decrypting traffic that never leaves the local network, which avoids performance overhead and potential certificate validation issues with internal services. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this question tests your understanding of how to balance security with usability, and a common trap is assuming that decrypting all traffic is safer—it is not, as selective decryption based on URL categories or destination zones is recommended. A helpful memory tip is “Trust the CA, skip the LAN” to recall that you must deploy the CA certificate for trust and avoid decrypting internal traffic.
PCNSA Decryption and Monitoring Practice Question
This PCNSA practice question tests your understanding of decryption and monitoring. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO of the following are best practices for configuring SSL Forward Proxy decryption? (Choose two.)
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
✓
Exclude traffic to financial and healthcare sites from decryption.
Options B and D are correct. Option A is wrong because CA-signed certs are recommended for trust. Option C is wrong because decrypting internal traffic can cause issues; best practice is to exclude internal traffic. Option E is wrong because decrypting all traffic is not recommended; use selective decryption.
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.
✗
Use a self-signed certificate for decryption.
Why it's wrong here
Self-signed certs cause trust issues; use CA-signed.
✗
Decrypt all internal traffic including server-to-server.
Why it's wrong here
Internal traffic often has performance and compatibility issues.
✓
Exclude traffic to financial and healthcare sites from decryption.
Why this is correct
Compliance requirements often prohibit decryption of sensitive sites.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Decrypt all outbound traffic regardless of destination.
Why it's wrong here
Not a best practice; selective decryption reduces overhead.
✓
Install the firewall's CA certificate on all client devices.
Why this is correct
Ensures clients trust the decrypted connections.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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.
Decryption and Monitoring — This question tests Decryption and Monitoring — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Exclude traffic to financial and healthcare sites from decryption. — Options B and D are correct. Option A is wrong because CA-signed certs are recommended for trust. Option C is wrong because decrypting internal traffic can cause issues; best practice is to exclude internal traffic. Option E is wrong because decrypting all traffic is not recommended; use selective decryption.
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: "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?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to decrypt all SSL traffic from internal users to external websites. They have deployed a Palo Alto Networks firewall in forward proxy mode and installed a trusted root CA certificate on all endpoints. Users, however, are complaining about certificate errors when accessing HTTPS sites. Which configuration step is most likely missing?
easy
A.The decryption profile is set to block sessions with untrusted certificates.
B.The firewall is performing inbound inspection instead of forward proxy.
✓ C.The firewall's decryption certificate is not signed by the installed root CA.
D.No decryption profile is attached to the decryption rule.
Why C: Option C is correct because in forward proxy decryption, the firewall generates a decryption certificate that must be signed by the trusted root CA installed on the endpoints. If the decryption certificate is self-signed or signed by a different CA, the browser will not trust it, causing certificate errors. The root CA certificate must be installed on all endpoints to establish a chain of trust for the firewall-generated certificates.
Variation 2. 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?
medium
A.The decryption policy uses 'No Decrypt' for the internal application's URL category.
B.The decryption policy is set to 'Decrypt' for all traffic, causing performance bottlenecks.
✓ C.The firewall's CA certificate is not installed in the trusted root store on user endpoints.
D.The firewall is configured to decrypt traffic from the internal zone, but not the external zone.
Why C: 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.
Last reviewed: Jun 6, 2026
Question Discussion
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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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