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 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 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 D is correct: YouTube traffic uses HTTPS, and without SSL decryption, the firewall cannot inspect the URL. Therefore, the URL category condition fails, and the rule does not match. The traffic is then denied by a default deny rule. Option A is wrong because the URL filtering license is required but typically already in place. Option B is wrong because zones are configured. Option C is wrong because application and URL category are ANDed; the issue is decryption, not logic.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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
Standard ACLs match source addresses.
✗
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: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNSE ACL questions on filtering logic and placement.
Securing Traffic and App-ID — This question tests Securing Traffic and App-ID — Standard ACLs match source addresses..
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 D is correct: YouTube traffic uses HTTPS, and without SSL decryption, the firewall cannot inspect the URL. Therefore, the URL category condition fails, and the rule does not match. The traffic is then denied by a default deny rule. Option A is wrong because the URL filtering license is required but typically already in place. Option B is wrong because zones are configured. Option C is wrong because application and URL category are ANDed; the issue is decryption, not logic.
What should I do if I get this PCNSE question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNSE ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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