- A
The rule must also specify the source zone.
Why wrong: Zones are likely already defined; missing zones would cause a different error.
- B
The application 'youtube' matches all YouTube traffic, so the URL category does not further filter because the application is matched first.
Why wrong: Both conditions are ANDed; the application match does not override the URL category.
- C
The URL category is not being applied because the traffic is encrypted and SSL decryption is not enabled.
Without decryption, the firewall cannot see the URL, so the URL category condition never matches.
- D
The URL filtering license is not installed or expired.
Why wrong: If the license were missing, URL filtering would not work at all, but the question implies it is configured.
Question 453 of 516
Why URL Filtering Fails on HTTPS Without SSL Decryption
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 school district wants to allow YouTube for Education (a subcategory of YouTube) but block general YouTube traffic. The firewall uses URL filtering and App-ID. Currently, all YouTube traffic is identified as 'youtube' application, and the URL filtering category is 'educational-videos' for the education version. The administrator creates a security rule that allows application 'youtube' and URL category 'educational-videos'. However, all YouTube traffic 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 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
✓
The URL category is not being applied because the traffic is encrypted and SSL decryption is not enabled.
Option C is correct because when traffic is encrypted (HTTPS), the firewall cannot inspect the URL path or query parameters unless SSL decryption is enabled. Without decryption, URL filtering relies on the Server Name Indication (SNI) or IP address, which may not distinguish between 'youtube' and 'youtube.com/education' traffic. Since the rule requires both the application 'youtube' and the URL category 'educational-videos', the firewall cannot match the URL category for encrypted YouTube traffic, causing all YouTube traffic to be blocked by the implicit deny rule.
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 rule must also specify the source zone.
Why it's wrong here
Zones are likely already defined; missing zones would cause a different error.
- ✗
The application 'youtube' matches all YouTube traffic, so the URL category does not further filter because the application is matched first.
Why it's wrong here
Both conditions are ANDed; the application match does not override the URL category.
- ✓
The URL category is not being applied because the traffic is encrypted and SSL decryption is not enabled.
Why this is correct
Without decryption, the firewall cannot see the URL, so the URL category condition never matches.
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 URL filtering license is not installed or expired.
Why it's wrong here
If the license were missing, URL filtering would not work at all, but the question implies it is configured.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume App-ID and URL filtering are independent and always work together, but they overlook that URL filtering on encrypted traffic requires SSL decryption to inspect the URL path, a nuance frequently tested in PCNSE questions about decryption policies.
Detailed technical explanation
How to think about this question
Under the hood, Palo Alto Networks firewalls use SSL decryption to inspect encrypted traffic for URL filtering; without it, the firewall can only match the URL category based on the SNI field in the TLS handshake or the destination IP address, which is often insufficient for subcategories like 'educational-videos' within YouTube. In a real-world scenario, even if the SNI indicates 'youtube.com', the firewall cannot see the '/education' path, so the URL category defaults to 'youtube' (general) rather than 'educational-videos'. This is why SSL decryption is critical for granular URL filtering on HTTPS 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 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.
Visual reference
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: The URL category is not being applied because the traffic is encrypted and SSL decryption is not enabled. — Option C is correct because when traffic is encrypted (HTTPS), the firewall cannot inspect the URL path or query parameters unless SSL decryption is enabled. Without decryption, URL filtering relies on the Server Name Indication (SNI) or IP address, which may not distinguish between 'youtube' and 'youtube.com/education' traffic. Since the rule requires both the application 'youtube' and the URL category 'educational-videos', the firewall cannot match the URL category for encrypted YouTube traffic, causing all YouTube traffic to be blocked by the implicit deny rule.
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.
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Last reviewed: Jul 4, 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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