- A
The firewall must be rebooted for the custom App-ID to take effect.
Why wrong: Committing the configuration is sufficient; reboot is not required.
- B
An application override rule has not been configured to associate the traffic with the custom App-ID.
Application override is required to bypass signature-based identification and assign the custom App-ID.
- C
The custom App-ID must be enabled in the 'Applications' section of the firewall settings.
Why wrong: Custom App-IDs are enabled by default once configured.
- D
The firewall cannot identify applications over UDP.
Why wrong: App-ID supports UDP application identification.
Question 397 of 516
PCNSE Securing Traffic and App-ID Practice Question
This PCNSE practice question tests your understanding of securing traffic and app-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.
A company deploys a Palo Alto Networks firewall in a data center. They have a critical application that uses a proprietary protocol over UDP port 12345. The firewall is not correctly identifying the traffic as the custom App-ID they created. They have verified that the custom App-ID is correctly configured and committed. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
An application override rule has not been configured to associate the traffic with the custom App-ID.
The custom App-ID is correctly configured and committed, but the firewall still does not identify the traffic because App-IDs are based on application signatures and behavioral analysis. For a proprietary protocol over UDP, the firewall may not have a signature to match it, so an application override rule is required to explicitly associate the traffic (based on IP, port, or protocol) with the custom App-ID. Without this override, the firewall will continue to treat the traffic as unknown or attempt to match it against built-in App-IDs.
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.
- ✗
The firewall must be rebooted for the custom App-ID to take effect.
Why it's wrong here
Committing the configuration is sufficient; reboot is not required.
- ✓
An application override rule has not been configured to associate the traffic with the custom App-ID.
Why this is correct
Application override is required to bypass signature-based identification and assign the custom App-ID.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The custom App-ID must be enabled in the 'Applications' section of the firewall settings.
Why it's wrong here
Custom App-IDs are enabled by default once configured.
- ✗
The firewall cannot identify applications over UDP.
Why it's wrong here
App-ID supports UDP application identification.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a correctly configured custom App-ID will automatically identify traffic, but they overlook the need for an Application Override rule to explicitly bind the traffic to that App-ID when the firewall cannot match it via signatures.
Detailed technical explanation
How to think about this question
Application Override rules bypass App-ID's signature-based identification by directly mapping traffic (e.g., source/destination IP, port, protocol) to a custom App-ID. This is essential for proprietary or encrypted protocols where the firewall cannot generate a signature. Under the hood, the firewall uses a multi-pass architecture: the first pass performs basic classification, and App-ID runs in subsequent passes; an override forces the application to be set immediately without deeper inspection.
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 practitioner preparing for the PCNSE exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An application override rule has not been configured to associate the traffic with the custom App-ID. — The custom App-ID is correctly configured and committed, but the firewall still does not identify the traffic because App-IDs are based on application signatures and behavioral analysis. For a proprietary protocol over UDP, the firewall may not have a signature to match it, so an application override rule is required to explicitly associate the traffic (based on IP, port, or protocol) with the custom App-ID. Without this override, the firewall will continue to treat the traffic as unknown or attempt to match it against built-in App-IDs.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 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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