Quick Answer
The correct answer is that the security rule does not have the Application set to 'web-browsing' for that traffic. This is because Palo Alto Networks App-ID identifies the actual application—HTTP, in this case—regardless of the port being used, such as the non-standard port 8080. Even if the firewall’s security policy allows the port, it will block the traffic unless the rule explicitly permits the application ‘web-browsing’. On the PCNSA exam, this scenario tests your understanding that App-ID decouples application identification from port, a common trap where candidates assume port-based rules suffice. Remember, a port is just a door; App-ID checks who is knocking. The firewall drops the traffic by default if the application is not allowed, even on a permitted port. Memory tip: “App first, port second—if the app isn’t in the rule, the traffic is doomed.”
This PCNSA practice question tests your understanding of app-id and content-id. 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.
An organization uses App-ID to allow 'web-browsing' but notices that some web traffic is being blocked. The traffic is HTTP over port 8080. What is a likely cause?
The 'web-browsing' application does not include HTTP.
Why wrong: It does.
A custom application must be created for port 8080.
Why wrong: No, web-browsing works on any port.
The security rule does not have Application set to 'web-browsing' for that traffic.
If the rule only allows web-browsing on port 80/443, it may not match port 8080.
App-ID cannot identify HTTP over non-standard ports.
Why wrong: App-ID can identify HTTP on any port.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The security rule does not have Application set to 'web-browsing' for that traffic.
Option C is correct because if the security rule does not have 'web-browsing' set as the Application, the firewall will not allow HTTP traffic even if the port (8080) is permitted. App-ID identifies the application regardless of port, but the security policy must explicitly allow the application for the traffic to pass. In this case, the traffic is being blocked because the rule either has a different application or no application specified, so the firewall drops it by default.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The 'web-browsing' application does not include HTTP.
Why it's wrong here
It does.
A custom application must be created for port 8080.
Why it's wrong here
No, web-browsing works on any port.
The security rule does not have Application set to 'web-browsing' for that traffic.
Why this is correct
If the rule only allows web-browsing on port 80/443, it may not match port 8080.
Related concept
Read the scenario before looking for a memorised answer.
App-ID cannot identify HTTP over non-standard ports.
Why it's wrong here
App-ID can identify HTTP on any port.
Common exam traps
The trap here is that candidates often assume App-ID relies on port numbers and that non-standard ports require custom applications, but App-ID identifies applications by content, not port, so the issue is almost always the security rule's application setting.
Detailed technical explanation
App-ID uses multiple identification methods, including protocol decoders, SSL/TLS fingerprinting, and behavioral heuristics, to identify applications regardless of port. For HTTP, the decoder inspects the actual HTTP request/response headers (e.g., GET, POST, Host) to confirm the application, even on non-standard ports like 8080. In a real-world scenario, an organization might have a web proxy on port 8080, and App-ID would correctly classify that traffic as 'web-browsing' if the security rule allows it.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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
App-ID and Content-ID — This question tests App-ID and Content-ID — Read the scenario before looking for a memorised answer..
The correct answer is: The security rule does not have Application set to 'web-browsing' for that traffic. — Option C is correct because if the security rule does not have 'web-browsing' set as the Application, the firewall will not allow HTTP traffic even if the port (8080) is permitted. App-ID identifies the application regardless of port, but the security policy must explicitly allow the application for the traffic to pass. In this case, the traffic is being blocked because the rule either has a different application or no application specified, so the firewall drops it by default.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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