Quick Answer
The answer is a security policy with application-ID. This is correct because application-ID enables granular control over applications like BitTorrent by inspecting traffic beyond port numbers, allowing you to block file-sharing applications while permitting HTTP and HTTPS based on their unique application signatures rather than relying on ports like 80 or 443, which BitTorrent can easily bypass. On the PCNSA exam, this tests your understanding of App-ID’s role in next-generation firewall policy, often appearing in scenario-based questions where a simple port-based rule would fail. A common trap is choosing a port-based security policy, which cannot distinguish BitTorrent from web traffic. Remember the mnemonic: “App-ID, not port-ID, for app-level fort.”
This PCNSA practice question tests your understanding of policy evaluation and management. 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.
A company wants to block file-sharing applications like BitTorrent, but allow HTTP and HTTPS. Which type of policy is most appropriate to achieve this granular control?
Security policy with application-ID.
Application-ID enables control over specific applications regardless of port.
Decryption policy.
Why wrong: Decryption policy is for decrypting traffic, not blocking applications.
Security policy with service only.
Why wrong: Service only matches port/protocol, not application.
Policy-based forwarding.
Why wrong: PBF is for traffic path selection, not application control.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Security policy with application-ID.
Option A is correct because application-ID allows granular control over applications, not just ports. Option B only uses port/protocol, not application. Option C is for path selection. Option D is for 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
For each option: why learners choose it and why it is or isn't the right answer here.
Security policy with application-ID.
Why this is correct
Application-ID enables control over specific applications regardless of port.
Related concept
Static NAT maps one inside address to one outside address.
Decryption policy.
Why it's wrong here
Decryption policy is for decrypting traffic, not blocking applications.
Security policy with service only.
Why it's wrong here
Service only matches port/protocol, not application.
Policy-based forwarding.
Why it's wrong here
PBF is for traffic path selection, not application control.
Common exam traps
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
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.
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
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
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.
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FAQ
Policy Evaluation and Management — This question tests Policy Evaluation and Management — Static NAT maps one inside address to one outside address..
The correct answer is: Security policy with application-ID. — Option A is correct because application-ID allows granular control over applications, not just ports. Option B only uses port/protocol, not application. Option C is for path selection. Option D is for decryption.
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.
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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