The answer is that HTTPS traffic is blocked because the security policy rule allows the 'web-browsing' application, but HTTPS uses the 'ssl' application instead. On Palo Alto firewalls, application matching is granular and protocol-specific; 'web-browsing' only matches unencrypted HTTP traffic (port 80), while encrypted HTTPS sessions (port 443) are identified by the 'ssl' application. Since the rule’s application match is set to 'web-browsing', it fails to match the HTTPS session, which then hits the implicit deny rule at the end of the policy. This is a classic trap on the PCNSA exam: candidates often assume 'web-browsing' covers all web traffic, but Palo Alto separates applications by their underlying protocol and encryption method. The exam tests your understanding that application-based policies require exact application matches, not port-based assumptions. Memory tip: think "HTTP = web-browsing, HTTPS = ssl" — if you see SSL, you need a separate rule or an application group that includes both.
PCNSA Device Management and Services Practice Question
This PCNSA practice question tests your understanding of device management and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Refer to the exhibit. The administrator notices that traffic from 192.168.1.100 to 10.1.1.1 using HTTPS is being blocked. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application is web-browsing, but HTTPS uses ssl application.
The exhibit shows a security policy rule that allows 'web-browsing' application traffic. HTTPS traffic uses the 'ssl' application, not 'web-browsing'. Since the rule's application match is set to 'web-browsing', it does not match HTTPS sessions, causing them to be blocked by the implicit deny rule at the end of the policy.
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 source IP is not in the range.
Why it's wrong here
Source IP 192.168.1.100 is within 192.168.1.0/24.
✗
The destination is in 10.0.0.0/8 but the policy is missing service TCP/443.
Why it's wrong here
No need to specify service separately when using application-default.
✗
The rule is not committed.
Why it's wrong here
Possible but less specific; application mismatch is more likely.
✓
The application is web-browsing, but HTTPS uses ssl application.
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the misconception that allowing a port (TCP/443) is sufficient to permit HTTPS traffic, but in Palo Alto firewalls, the application must also be explicitly allowed in the rule.
Detailed technical explanation
How to think about this question
In Palo Alto Networks firewalls, application-based policies override port-based policies. Even if TCP/443 is allowed, the firewall performs App-ID inspection and matches the session to the 'ssl' application. If the rule only permits 'web-browsing', the session is denied. This behavior is defined in the App-ID engine, which identifies applications by signature, not just port. A common real-world scenario is allowing HTTPS but forgetting to include the 'ssl' application, leading to blocked secure web traffic.
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.
Device Management and Services — This question tests Device Management and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application is web-browsing, but HTTPS uses ssl application. — The exhibit shows a security policy rule that allows 'web-browsing' application traffic. HTTPS traffic uses the 'ssl' application, not 'web-browsing'. Since the rule's application match is set to 'web-browsing', it does not match HTTPS sessions, causing them to be blocked by the implicit deny rule at the end of the policy.
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.
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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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security administrator notices that a security policy rule is not matching traffic that should be allowed. The rule specifies source address as 10.0.1.0/24, destination address as 192.168.2.0/24, and application 'web-browsing'. The traffic originates from 10.0.1.5 to 192.168.2.10 using HTTPS. The traffic log shows that another rule with higher priority is matching and denying the traffic. What should the administrator check first?
medium
A.Ensure that logging is enabled on the rule
✓ B.Review the application specified in the rule and the actual traffic
C.Check the zone configuration for the destination
D.Verify that the source and destination IP ranges are correct
Why B: The rule specifies application 'web-browsing', which typically matches HTTP (TCP/80) traffic, but the actual traffic is HTTPS (TCP/443). In Palo Alto Networks firewalls, application identification is based on the App-ID engine, which inspects traffic beyond the port; 'web-browsing' does not match HTTPS unless explicitly configured. Therefore, the administrator should first review the application specified in the rule versus the actual traffic to understand why the rule is not matching.
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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.
Question Discussion
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