The correct answer is to create security rules that use application-based policies to allow trusted applications without additional inspection. This approach reduces CPU load from application identification because the firewall can match traffic against known application signatures and bypass deep packet inspection for those trusted flows, offloading processing from the application identification engine. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this concept tests your understanding of how to optimize dataplane performance while maintaining security—a common trap is assuming that disabling application identification globally or increasing logging will help, but both break policy enforcement or add overhead. A useful memory tip: think of it as "trust and skip"—once you identify a trusted app, you skip the heavy lifting of re-inspecting every packet.
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. 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.
A PA-5250 firewall is experiencing high CPU usage on the dataplane. Analysis shows that a large amount of traffic is being processed by the application identification engine. What can be done to reduce the CPU load?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create security rules that use application-based policies to allow trusted applications without additional inspection.
Creating security rules that use application-based policies to allow trusted applications without additional inspection reduces CPU load because the firewall can skip deep packet inspection for those applications once identified. This offloads processing from the application identification engine by allowing traffic based on application signatures rather than performing full identification on every packet. In contrast, disabling application identification globally would break security policy enforcement, and increasing logging or changing the default rule would not reduce the CPU burden from application identification.
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.
✗
Disable application identification globally.
Why it's wrong here
This would reduce functionality significantly.
✗
Increase logging to debug which applications are being processed.
Why it's wrong here
More logging increases CPU usage.
✗
Change the default rule to allow all traffic based on port only.
Why it's wrong here
This would not reduce App-ID processing for allowed sessions.
✓
Create security rules that use application-based policies to allow trusted applications without additional inspection.
Why this is correct
Explicit application allow rules bypass further App-ID processing.
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 may think disabling application identification or increasing logging will help, but Palo Alto Networks tests the understanding that application-based allow rules reduce CPU by leveraging the identification result rather than disabling the engine or adding overhead.
Detailed technical explanation
How to think about this question
The PA-5250 dataplane uses a single-pass architecture where the application identification engine performs signature matching against traffic flows. By creating application-based policies that allow trusted applications (e.g., ssl, dns, web-browsing) without further inspection, the firewall can apply a 'allow' action after the first few packets identify the application, bypassing deeper decryption or threat inspection. In a real-world scenario, an organization with high volumes of Office 365 traffic could create a rule to allow that application ID directly, reducing the need for the engine to re-identify each flow and lowering CPU utilization.
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.
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create security rules that use application-based policies to allow trusted applications without additional inspection. — Creating security rules that use application-based policies to allow trusted applications without additional inspection reduces CPU load because the firewall can skip deep packet inspection for those applications once identified. This offloads processing from the application identification engine by allowing traffic based on application signatures rather than performing full identification on every packet. In contrast, disabling application identification globally would break security policy enforcement, and increasing logging or changing the default rule would not reduce the CPU burden from application identification.
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.
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Question Discussion
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