This PCNSA practice question tests your understanding of app-id and content-id. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 administrator needs to block all traffic from a specific application that uses multiple ports. Which TWO methods can achieve this? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a security rule with the application and action 'deny'.
Option A is correct because App-ID identifies traffic based on application signatures, not just ports. By creating a security rule with the specific application and setting the action to 'deny', the firewall blocks all traffic matching that application regardless of the ports or protocols it uses. This is the most precise and effective method to block an application that uses multiple ports.
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.
✓
Create a security rule with the application and action 'deny'.
Why this is correct
Denying the application blocks all its traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Block the common ports used by the application.
Why it's wrong here
The application may use other ports.
✗
Disable App-ID on the zone to prevent inspection.
Why it's wrong here
This would not block the application specifically.
✗
Create a security rule allowing the application but with a limit.
Why it's wrong here
Allowing the application would not block it.
✓
Use an Application Override to categorize the traffic and then block it.
Why this is correct
Application Override allows blocking based on override.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think blocking common ports (Option B) is sufficient, but the exam tests the understanding that App-ID is application-aware and port-independent, making application-based blocking the correct approach.
Detailed technical explanation
How to think about this question
App-ID uses multiple identification mechanisms, including application signatures, SSL decryption, and protocol decoding, to identify traffic even when it uses non-standard ports. An Application Override rule forces the firewall to classify traffic based on a user-defined application, bypassing App-ID's automatic identification; this can then be combined with a deny action to block the application. In real-world scenarios, applications like BitTorrent or Skype often use random high ports, making port-based blocking futile.
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.
App-ID and Content-ID — This question tests App-ID and Content-ID — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a security rule with the application and action 'deny'. — Option A is correct because App-ID identifies traffic based on application signatures, not just ports. By creating a security rule with the specific application and setting the action to 'deny', the firewall blocks all traffic matching that application regardless of the ports or protocols it uses. This is the most precise and effective method to block an application that uses multiple ports.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.