The answer is to create an Application Override rule for FTP on the required source and destination addresses. This is the most effective method because an Application Override explicitly tells the Palo Alto Networks firewall to treat traffic matching specific IPs and ports as the designated application, bypassing App-ID’s port-based heuristics. On the PCNSA exam, this scenario tests your understanding that App-ID relies on default port signatures unless overridden; FTP over non-standard ports will be misclassified or missed entirely without this override. A common trap is confusing Service definitions with Application Overrides—services only map ports to protocols, not to application identity. Remember the key distinction: App-ID identifies applications, while an Application Override forces identification for custom ports. Memory tip: “Override the port, not the service.”
PCNSA App-ID and Content-ID Practice Question
This PCNSA practice question tests your understanding of app-id and content-id. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
During a security audit, it is discovered that FTP traffic over non-standard ports is bypassing App-ID inspection. What is the most effective method to ensure all FTP traffic is identified, regardless of port?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an Application Override rule for FTP on the required source and destination addresses.
Option A is correct because an Application Override for FTP can be configured to identify FTP traffic on any port by specifying the application and source/destination. Option B is wrong because disabling App-ID removes inspection. Option C is wrong because updating App-ID database does not change detection behavior for custom ports. Option D is wrong because Service definitions are port-based, not application-based.
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.
✗
Update the App-ID and threat databases to the latest version.
Why it's wrong here
Databases do not change detection on non-standard ports.
✗
Set the security policy to 'allow' without App-ID to ensure FTP works.
Why it's wrong here
This would bypass all application inspection.
✗
Add the non-standard port to the FTP service definition.
Why it's wrong here
Service definition alone does not guarantee App-ID identification.
✓
Create an Application Override rule for FTP on the required source and destination addresses.
Why this is correct
Application Override forces App-ID to treat the traffic as FTP.
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.
App-ID and Content-ID — This question tests App-ID and Content-ID — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create an Application Override rule for FTP on the required source and destination addresses. — Option A is correct because an Application Override for FTP can be configured to identify FTP traffic on any port by specifying the application and source/destination. Option B is wrong because disabling App-ID removes inspection. Option C is wrong because updating App-ID database does not change detection behavior for custom ports. Option D is wrong because Service definitions are port-based, not application-based.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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.
Question Discussion
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