This PCNSE practice question tests your understanding of troubleshoot. 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 new application is not being identified by the firewall. Traffic for the application is being treated as 'unknown-tcp'. Which action should be taken to resolve this?
Modify the security policy rule to allow 'unknown-tcp'.
Why wrong: Allowing unknown-tcp would permit the traffic but still not identify the application.
B
Update the application and threat signatures.
Why wrong: If the application is brand new, it may not be in the signature database yet; updating might help, but the question assumes it's a custom app.
C
Disable application identification on the zone.
Why wrong: Disabling application identification would make all traffic unknown, which is counterproductive.
D
Create an application override for the application.
An application override allows the firewall to identify traffic based on port and IP criteria, useful for custom applications.
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 for the application.
Option B is correct because if the application is not identified, it may be a custom application that needs to be defined via an application override. Option A is wrong because the application signature would need to be updated if it's a known application, but the question implies it's a new application. Option C is wrong because disabling application identification would not help. Option D is wrong because a security policy rule change would not cause the firewall to identify the application.
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.
✗
Modify the security policy rule to allow 'unknown-tcp'.
Why it's wrong here
Allowing unknown-tcp would permit the traffic but still not identify the application.
✗
Update the application and threat signatures.
Why it's wrong here
If the application is brand new, it may not be in the signature database yet; updating might help, but the question assumes it's a custom app.
✗
Disable application identification on the zone.
Why it's wrong here
Disabling application identification would make all traffic unknown, which is counterproductive.
✓
Create an application override for the application.
Why this is correct
An application override allows the firewall to identify traffic based on port and IP criteria, useful for custom applications.
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 PCNSE NAT questions on configuration and troubleshooting.
Troubleshoot — This question tests Troubleshoot — 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 for the application. — Option B is correct because if the application is not identified, it may be a custom application that needs to be defined via an application override. Option A is wrong because the application signature would need to be updated if it's a known application, but the question implies it's a new application. Option C is wrong because disabling application identification would not help. Option D is wrong because a security policy rule change would not cause the firewall to identify the application.
What should I do if I get this PCNSE 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 PCNSE 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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Question Discussion
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