- A
Disable unknown application identification to force stricter matching.
Why wrong: Disabling unknown app identification does not correct misidentification of known apps.
- B
Create a custom App-ID for webmail-gmail with stricter signatures.
Why wrong: Custom App-ID is unnecessary since webmail-gmail is already a known application.
- C
Review the session log to see if the application changed during the session.
Session logs show App-ID updates; the application may have been re-identified later.
- D
Increase the application identification timeout to allow more time for identification.
Why wrong: Timeout adjustment does not address signature matching issues.
- E
Enable packet capture on the security rule to collect traffic for analysis.
PCAP allows analyzing traffic to see why the wrong signature matched.
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.
A network engineer is troubleshooting an issue where a web application is being incorrectly identified as 'web-browsing' instead of 'webmail-gmail' by the Palo Alto Networks firewall. The firewall has App-ID enabled and all signatures are up to date. Which TWO actions should the engineer take to resolve this misidentification?
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
Review the session log to see if the application changed during the session.
Option C is correct because App-ID can reclassify a session as more data becomes available. A session that starts as 'web-browsing' may later be identified as 'webmail-gmail' once the firewall sees application-specific traffic (e.g., SMTP, IMAP, or proprietary Gmail API calls). Reviewing the session log to see if the application changed during the session helps confirm whether the firewall eventually identified the correct application.
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.
- ✗
Disable unknown application identification to force stricter matching.
Why it's wrong here
Disabling unknown app identification does not correct misidentification of known apps.
- ✗
Create a custom App-ID for webmail-gmail with stricter signatures.
Why it's wrong here
Custom App-ID is unnecessary since webmail-gmail is already a known application.
- ✓
Review the session log to see if the application changed during the session.
Why this is correct
Session logs show App-ID updates; the application may have been re-identified later.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the application identification timeout to allow more time for identification.
Why it's wrong here
Timeout adjustment does not address signature matching issues.
- ✓
Enable packet capture on the security rule to collect traffic for analysis.
Why this is correct
PCAP allows analyzing traffic to see why the wrong signature matched.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a static, one-time identification and overlook the fact that App-ID can dynamically reclassify a session as more data is analyzed, making the session log a critical diagnostic tool.
Detailed technical explanation
How to think about this question
App-ID uses multiple mechanisms (signature-based, behavioral, and heuristic) to identify applications. For webmail services like Gmail, the firewall may initially see HTTP/HTTPS traffic and classify it as 'web-browsing' until it detects specific application-layer patterns (e.g., X-Gmail-Received headers, specific URL patterns, or TLS SNI for mail.google.com). Enabling packet capture on the security rule (Option E) allows the engineer to inspect the raw traffic and verify whether the firewall is seeing the expected application signatures, which is a standard troubleshooting step.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: Review the session log to see if the application changed during the session. — Option C is correct because App-ID can reclassify a session as more data becomes available. A session that starts as 'web-browsing' may later be identified as 'webmail-gmail' once the firewall sees application-specific traffic (e.g., SMTP, IMAP, or proprietary Gmail API calls). Reviewing the session log to see if the application changed during the session helps confirm whether the firewall eventually identified the correct application.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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