- A
Update the application and threat signatures to the latest version, and verify that the application 'crm-base' correctly identifies the CRM traffic. If not, expand the policy to include a fallback application or use custom App-ID.
Keeping signatures updated ensures proper application identification. If the application is still not recognized, using a broader application (like 'ssl' with URL category) or creating a custom App-ID can resolve the mismatch.
- B
Enable SSL decryption to inspect the traffic and improve application identification.
Why wrong: Decryption helps identify applications, but the mismatch may persist if the application signature is outdated; also, decryption adds overhead. It is not the most direct fix.
- C
Modify the security policy to allow application 'web-browsing' instead of 'crm-base' and 'ssl'.
Why wrong: Allowing 'web-browsing' is too permissive and may allow unintended traffic, violating security posture.
- D
Check that the destination address object for the CRM server is correct and includes the CDN IPs.
Why wrong: Destination address does not affect application identification; the issue is application mismatch, not routing.
Fixing Application Identification Issues on Palo Alto Firewall
This PCNSA practice question tests your understanding of core concepts. 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 multinational company has deployed a Palo Alto Networks firewall in a datacenter to provide internet access to employees in the corporate office and remote branches via IPsec VPN. The firewall is configured with multiple virtual routers, security zones (trust, untrust, dmz, vpn), and policies for application and URL filtering. Recently, users in the corporate office report that they cannot access a critical cloud-based CRM application (https://crm.company.com) from their workstations, while access from remote VPN users works fine. Other websites are accessible from the corporate office. The IT team has verified that DNS resolution is correct and that the CRM server responds to pings from the firewall's management IP. The security policy includes a rule from trust to untrust that allows application 'crm-base' and 'ssl' with URL category 'crm-sites'. The administrator has checked the traffic logs and sees that sessions are being denied with the reason 'application mismatch'. Which of the following is the most likely cause and correct course of action?
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
Update the application and threat signatures to the latest version, and verify that the application 'crm-base' correctly identifies the CRM traffic. If not, expand the policy to include a fallback application or use custom App-ID.
The application mismatch error indicates that the firewall's App-ID is not correctly identifying the CRM traffic as 'crm-base'. This could be because the application signatures are outdated, or the CRM application uses protocols or patterns not fully captured by the current App-ID. The correct course of action is to update the application and threat signatures to the latest version. If the issue persists, the administrator should expand the security policy to include a fallback application (like 'ssl' or 'web-browsing') or create a custom App-ID to correctly identify the traffic. Option B is incorrect because SSL decryption would help inspect encrypted traffic but is not the direct cause of application mismatch; the issue is identification, not decryption. Option C is incorrect because using 'web-browsing' would be too broad and weaken security. Option D is incorrect because the destination address is correctly set; the issue is with application identification on the firewall.
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.
- ✓
Update the application and threat signatures to the latest version, and verify that the application 'crm-base' correctly identifies the CRM traffic. If not, expand the policy to include a fallback application or use custom App-ID.
Why this is correct
Keeping signatures updated ensures proper application identification. If the application is still not recognized, using a broader application (like 'ssl' with URL category) or creating a custom App-ID can resolve the mismatch.
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.
- ✗
Enable SSL decryption to inspect the traffic and improve application identification.
Why it's wrong here
Decryption helps identify applications, but the mismatch may persist if the application signature is outdated; also, decryption adds overhead. It is not the most direct fix.
- ✗
Modify the security policy to allow application 'web-browsing' instead of 'crm-base' and 'ssl'.
Why it's wrong here
Allowing 'web-browsing' is too permissive and may allow unintended traffic, violating security posture.
- ✗
Check that the destination address object for the CRM server is correct and includes the CDN IPs.
Why it's wrong here
Destination address does not affect application identification; the issue is application mismatch, not routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 PCNSA 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.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Core Concepts — This question tests Core Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Update the application and threat signatures to the latest version, and verify that the application 'crm-base' correctly identifies the CRM traffic. If not, expand the policy to include a fallback application or use custom App-ID. — The application mismatch error indicates that the firewall's App-ID is not correctly identifying the CRM traffic as 'crm-base'. This could be because the application signatures are outdated, or the CRM application uses protocols or patterns not fully captured by the current App-ID. The correct course of action is to update the application and threat signatures to the latest version. If the issue persists, the administrator should expand the security policy to include a fallback application (like 'ssl' or 'web-browsing') or create a custom App-ID to correctly identify the traffic. Option B is incorrect because SSL decryption would help inspect encrypted traffic but is not the direct cause of application mismatch; the issue is identification, not decryption. Option C is incorrect because using 'web-browsing' would be too broad and weaken security. Option D is incorrect because the destination address is correctly set; the issue is with application identification on the firewall.
What should I do if I get this PCNSA question wrong?
Identify which PCNSA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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.
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Last reviewed: Jun 24, 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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