- A
Increase the 'timeout' value for the custom application signature from 0 to 60 seconds.
Why wrong: The timeout value determines how long App-ID waits before it updates the application identification; it does not affect the initial identification process.
- B
Modify the custom application signature to use the 'tcp' protocol decoder and set the port to 8443.
Why wrong: The protocol decoder and port are already correctly configured as verified; this change is unnecessary and would not resolve the misclassification.
- C
Disable SSL decryption for the CRM traffic to allow App-ID to inspect the unencrypted HTTP headers.
Why wrong: Disabling SSL decryption would not help; it would prevent App-ID from inspecting HTTP headers in encrypted traffic, potentially making identification worse.
- D
Create a new security rule with an application override that sets the application to 'crm-app' for the CRM traffic.
An application override forces the firewall to identify the traffic as the specified application, bypassing App-ID's detection. This is a valid approach when App-ID fails to correctly classify traffic despite a properly configured custom signature.
PCNSE Securing Traffic and App-ID Practice Question
This PCNSE practice question tests your understanding of securing traffic and app-id. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Dynamics Inc., a mid-sized company, uses Palo Alto Networks PA-5250 firewalls at their data center. They recently deployed a new web-based CRM application that uses HTTPS and WebSocket connections on TCP port 8443. The security team configured a custom application 'crm-app' with a signature that matches the 'Host' header in HTTP requests, and set the protocol decoder to 'tcp' and the port to 8443. The application is used in a security policy to allow traffic from internal users to the CRM server. However, after deployment, the traffic logs show the application is identified as 'ssl' instead of 'crm-app'. The firewall's App-ID and threat prevention subscriptions are active and up to date. The team has verified that the custom application signature is correctly configured, and the traffic clearly matches the defined host header. Which action should be taken to ensure the CRM traffic is correctly identified by App-ID?
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
Create a new security rule with an application override that sets the application to 'crm-app' for the CRM traffic.
Option B is correct because when App-ID fails to correctly identify traffic despite a properly configured custom application signature, an application override in a security policy can force the identification. This is a supported and common troubleshooting step. Option A is incorrect because disabling SSL decryption would prevent App-ID from inspecting HTTPS headers, making identification less accurate. Option C is incorrect because the timeout parameter controls how long App-ID waits before updating the application, not the initial identification. Option D is incorrect because the protocol decoder and port are already correctly set per the verification; changing them would not resolve the misclassification.
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.
- ✗
Increase the 'timeout' value for the custom application signature from 0 to 60 seconds.
Why it's wrong here
The timeout value determines how long App-ID waits before it updates the application identification; it does not affect the initial identification process.
- ✗
Modify the custom application signature to use the 'tcp' protocol decoder and set the port to 8443.
Why it's wrong here
The protocol decoder and port are already correctly configured as verified; this change is unnecessary and would not resolve the misclassification.
- ✗
Disable SSL decryption for the CRM traffic to allow App-ID to inspect the unencrypted HTTP headers.
- ✓
Create a new security rule with an application override that sets the application to 'crm-app' for the CRM traffic.
Why this is correct
An application override forces the firewall to identify the traffic as the specified application, bypassing App-ID's detection. This is a valid approach when App-ID fails to correctly classify traffic despite a properly configured custom signature.
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.
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Securing Traffic and App-ID — study guide chapter
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FAQ
Questions learners often ask
What does this PCNSE question test?
Securing Traffic and App-ID — This question tests Securing Traffic and App-ID — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a new security rule with an application override that sets the application to 'crm-app' for the CRM traffic. — Option B is correct because when App-ID fails to correctly identify traffic despite a properly configured custom application signature, an application override in a security policy can force the identification. This is a supported and common troubleshooting step. Option A is incorrect because disabling SSL decryption would prevent App-ID from inspecting HTTPS headers, making identification less accurate. Option C is incorrect because the timeout parameter controls how long App-ID waits before updating the application, not the initial identification. Option D is incorrect because the protocol decoder and port are already correctly set per the verification; changing them would not resolve the misclassification.
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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Last reviewed: Jun 24, 2026
This PCNSE 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 PCNSE exam.
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