- A
Change the security rule to use 'application-default' instead of the custom application.
Why wrong: 'application-default' only works if the port matches the default port for an application; port 4444 is not default for any known application.
- B
Add a service object for port 4444 and include it in the security rule.
Why wrong: Service objects define ports but do not affect application identification; the rule still requires application match.
- C
Create an Application Override policy for port 4444 and assign it to the 'ERP' application.
Application Override bypasses App-ID and forces traffic on that port to be treated as the specified application, enabling the security rule to match.
- D
Disable application identification on the firewall.
Why wrong: Disabling App-ID is a drastic measure that would prevent all application-based policy enforcement and is not the correct solution.
Quick Answer
The answer is to create an Application Override policy for port 4444 and assign it to the 'ERP' application. This is necessary because in Layer 2 transparent mode, the Palo Alto firewall cannot perform standard App-ID identification on traffic using non-standard ports; without an override, the custom application object 'ERP' will never be matched, even though it is correctly defined with TCP port 4444. An Application Override policy explicitly bypasses App-ID and maps the traffic directly to the 'ERP' application, allowing the security policy to permit the connection. On the PCNSA exam, this scenario tests your understanding of how App-ID behaves in transparent mode versus Layer 3 mode, and it is a common trap to assume a custom application object alone will work. Remember the key distinction: custom objects define the application, but only an Application Override policy enforces it on non-standard ports. Memory tip: "If the port is non-standard, override the app to get it sanctioned."
PCNSA Managing Objects Practice Question
This PCNSA practice question tests your understanding of managing objects. 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.
A company with a Palo Alto Networks firewall operating in Layer 2 transparent mode wants to control access to an internal ERP system. The ERP system uses a non-standard TCP port 4444. The security administrator creates a custom application object named 'ERP' with protocol set to 'tcp' and port range 4444-4444. Then, a security policy is configured allowing application 'ERP' from the internal zone to the ERP server zone. Users report they cannot connect to the ERP system. Firewall logs show no traffic matching the application 'ERP'. What should the administrator do to resolve the issue?
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 an Application Override policy for port 4444 and assign it to the 'ERP' application.
Option C is correct because in Layer 2 transparent mode, Palo Alto Networks firewalls rely on Application Override policies to bypass App-ID for traffic that uses non-standard ports. Since the custom application 'ERP' is defined with TCP port 4444 but App-ID cannot identify it on that port (as it is non-standard), an Application Override policy explicitly maps the traffic to the 'ERP' application, allowing the security policy to match and permit the traffic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the security rule to use 'application-default' instead of the custom application.
Why it's wrong here
'application-default' only works if the port matches the default port for an application; port 4444 is not default for any known application.
- ✗
Add a service object for port 4444 and include it in the security rule.
Why it's wrong here
Service objects define ports but do not affect application identification; the rule still requires application match.
- ✓
Create an Application Override policy for port 4444 and assign it to the 'ERP' application.
Why this is correct
Application Override bypasses App-ID and forces traffic on that port to be treated as the specified application, enabling the security rule to match.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable application identification on the firewall.
Why it's wrong here
Disabling App-ID is a drastic measure that would prevent all application-based policy enforcement and is not the correct solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume creating a custom application object with the correct port is sufficient, but they overlook that App-ID must first identify the traffic, which requires an Application Override for non-standard ports.
Detailed technical explanation
How to think about this question
App-ID uses multiple mechanisms (signatures, protocol decoders, heuristics) to identify applications, but for custom applications on non-standard ports, it cannot match unless an Application Override is configured. An Application Override policy tells the firewall to skip App-ID processing for that traffic and directly assign the specified application, ensuring the security policy can match it. This is critical in transparent mode where the firewall acts as a Layer 2 bridge and cannot rely on IP addresses or ports alone for application identification.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Managing Objects — study guide chapter
Learn the concepts, then practise the questions
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Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this PCNSA question test?
Managing Objects — This question tests Managing Objects — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an Application Override policy for port 4444 and assign it to the 'ERP' application. — Option C is correct because in Layer 2 transparent mode, Palo Alto Networks firewalls rely on Application Override policies to bypass App-ID for traffic that uses non-standard ports. Since the custom application 'ERP' is defined with TCP port 4444 but App-ID cannot identify it on that port (as it is non-standard), an Application Override policy explicitly maps the traffic to the 'ERP' application, allowing the security policy to match and permit the traffic.
What should I do if I get this PCNSA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 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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