- A
The security rule uses application 'ssl' but not 'web-browsing' for the traffic.
Why wrong: The application 'ssl' correctly identifies the encrypted web traffic; 'web-browsing' would be unnecessary as it is a subapplication.
- B
The firewall is missing the latest content updates for WildFire.
Why wrong: Even with latest updates, if WildFire is not enabled in the profile, it won't submit unknown files.
- C
The decryption exclusion list includes the domain of the malware source.
Why wrong: The domain is not in the financial services category, so it is decrypted.
- D
The Anti-Malware profile is set to 'default' which may not block unknown malware effectively.
The default profile uses only local signatures; without WildFire analysis, new or customized malware can bypass.
Quick Answer
The answer is that the Anti-Malware profile is set to 'default' which may not block unknown malware effectively. This is correct because the default Anti-Malware profile relies on known signature-based detection, and when malware uses a custom packer that is not recognized by current signatures, it will bypass detection entirely. In contrast, a profile that includes WildFire analysis would submit the unknown file for dynamic sandboxing, catching the malware based on behavior rather than static signatures. For the PCNSA exam, this scenario tests your understanding of how SSL decryption interacts with threat prevention profiles—specifically that decryption alone is insufficient without proper content inspection settings. A common trap is assuming the decryption exclusion list is the culprit, but the domain here is not in the excluded financial services category. Another pitfall is blaming missing content updates, but WildFire analysis would still catch a custom packer even with older signatures. Memory tip: "Default is for known threats; WildFire catches the wild ones."
PCNSA Securing Traffic Practice Question
This PCNSA practice question tests your understanding of securing traffic. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An organization implements SSL Forward Proxy to decrypt outbound HTTPS traffic, with a security rule that includes Vulnerability Protection and Anti-Malware profiles. Despite this, certain malware downloaded over HTTPS is not being blocked. The administrator observes that the traffic is decrypted and matches the security rule. The decryption policy excludes decryption for financial services category. The malware is delivered from a known malicious domain that is not in the financial services category. The analysis shows that the malware uses a custom packer that is not recognized by the current Anti-Malware signatures. What is the most likely reason the malware bypasses detection? The decryption exclusion list includes the domain of the malware source. The Anti-Malware profile is set to 'default' which may not block unknown malware effectively. The firewall is missing the latest content updates for WildFire. The security rule uses application 'ssl' but not 'web-browsing' for the traffic.
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 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
The Anti-Malware profile is set to 'default' which may not block unknown malware effectively.
Option B is correct because the default malware profile may rely on known signatures and may not detect unknown malware; a profile with WildFire analysis is needed. Option A is incorrect because the domain is not in the excluded category. Option C is plausible but less likely given that the malware uses a custom packer; WildFire would help if enabled. Option D is incorrect because 'ssl' is the application for decrypted SSL traffic, and 'web-browsing' would also apply if HTTP is used, but the actual application is detected correctly.
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.
- ✗
The security rule uses application 'ssl' but not 'web-browsing' for the traffic.
Why it's wrong here
The application 'ssl' correctly identifies the encrypted web traffic; 'web-browsing' would be unnecessary as it is a subapplication.
- ✗
The firewall is missing the latest content updates for WildFire.
Why it's wrong here
Even with latest updates, if WildFire is not enabled in the profile, it won't submit unknown files.
- ✗
The decryption exclusion list includes the domain of the malware source.
Why it's wrong here
The domain is not in the financial services category, so it is decrypted.
- ✓
The Anti-Malware profile is set to 'default' which may not block unknown malware effectively.
Why this is correct
The default profile uses only local signatures; without WildFire analysis, new or customized malware can bypass.
Clue confirmation
The clue word "most likely" 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.
- →
Securing Traffic — study guide chapter
Learn the concepts, then practise the questions
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Securing Traffic practice questions
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FAQ
Questions learners often ask
What does this PCNSA question test?
Securing Traffic — This question tests Securing Traffic — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The Anti-Malware profile is set to 'default' which may not block unknown malware effectively. — Option B is correct because the default malware profile may rely on known signatures and may not detect unknown malware; a profile with WildFire analysis is needed. Option A is incorrect because the domain is not in the excluded category. Option C is plausible but less likely given that the malware uses a custom packer; WildFire would help if enabled. Option D is incorrect because 'ssl' is the application for decrypted SSL traffic, and 'web-browsing' would also apply if HTTP is used, but the actual application is detected correctly.
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: "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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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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