- A
Enable hardware acceleration for the VPN tunnel on the branch firewalls.
Hardware acceleration offloads encryption to dedicated chips, boosting throughput significantly.
- B
Upgrade the branch office firewalls to PA-800 series appliances.
Why wrong: Upgrading hardware is expensive and not immediately needed; the PA-220 can be configured to perform better.
- C
Change the VPN IPSec cipher suite to use AES-256-GCM for stronger encryption.
Why wrong: While AES-256-GCM is strong, it may not improve throughput; hardware acceleration has a greater impact.
- D
Increase the MTU on the VPN tunnel interface to 1500 bytes to reduce fragmentation.
Why wrong: Increasing MTU may cause fragmentation in the network path, potentially worsening performance; MTU should be correctly set based on the path.
Quick Answer
The answer is to enable hardware acceleration for the VPN tunnel on the branch firewalls. This is correct because the PA-220 includes dedicated cryptographic hardware that offloads IPsec processing, but this feature is disabled by default, forcing the CPU to handle encryption in software and creating a bottleneck even when link utilization and CPU load appear moderate. On the PCNSA exam, this scenario tests your understanding of platform-specific features versus default configurations—a common trap is assuming that VPN performance issues always stem from bandwidth or CPU, when in fact the PA-220’s hardware acceleration is a no-cost, security-neutral fix. Remember the memory tip: “PA-220’s crypto chip is a sleeping giant—wake it up for VPN throughput.”
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. 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 company has deployed PA-220 firewalls at 50 branch offices, each connected to the corporate headquarters via IPSec VPN tunnels. Recently, users have reported slow file transfers across the VPN, especially for large files. The network team has checked link utilization and found that the VPN tunnel bandwidth is under 20% utilized, and CPU on the firewalls is around 40%. The security policies are basic, with no threat prevention profiles applied to the VPN traffic. The team suspects the issue is related to VPN performance. After reviewing the configuration, they notice that the VPN tunnels are configured with default settings. Which of the following actions would most likely improve VPN throughput without requiring hardware upgrades or changing the security level?
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
Enable hardware acceleration for the VPN tunnel on the branch firewalls.
The PA-220 firewall includes hardware acceleration for IPsec VPN processing, but this feature is not enabled by default. Enabling hardware acceleration offloads cryptographic operations to dedicated hardware, significantly improving throughput for large file transfers without requiring hardware upgrades or reducing security. Since the VPN tunnel bandwidth is underutilized and CPU is moderate, the bottleneck is likely software-based encryption, which hardware acceleration directly addresses.
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.
- ✓
Enable hardware acceleration for the VPN tunnel on the branch firewalls.
Why this is correct
Hardware acceleration offloads encryption to dedicated chips, boosting throughput significantly.
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.
- ✗
Upgrade the branch office firewalls to PA-800 series appliances.
Why it's wrong here
Upgrading hardware is expensive and not immediately needed; the PA-220 can be configured to perform better.
- ✗
Change the VPN IPSec cipher suite to use AES-256-GCM for stronger encryption.
Why it's wrong here
While AES-256-GCM is strong, it may not improve throughput; hardware acceleration has a greater impact.
- ✗
Increase the MTU on the VPN tunnel interface to 1500 bytes to reduce fragmentation.
Why it's wrong here
Increasing MTU may cause fragmentation in the network path, potentially worsening performance; MTU should be correctly set based on the path.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume stronger encryption (like AES-256-GCM) improves performance or that increasing MTU always helps, when in fact the default settings disable hardware acceleration, which is the primary lever for boosting VPN throughput without hardware changes.
Detailed technical explanation
How to think about this question
Hardware acceleration on Palo Alto Networks firewalls offloads IPsec encryption/decryption (e.g., AES, SHA) to a dedicated crypto engine, freeing the main CPU for other tasks. On the PA-220, this is configured under the VPN tunnel's 'Advanced' settings by enabling 'Hardware Offload' (or similar option). In real-world scenarios, software-based encryption can become a bottleneck at moderate CPU loads (e.g., 40%) because encryption is CPU-intensive, and without offload, throughput may plateau far below link capacity.
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 practitioner preparing for the PCNSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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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FAQ
Questions learners often ask
What does this PCNSA question test?
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: Enable hardware acceleration for the VPN tunnel on the branch firewalls. — The PA-220 firewall includes hardware acceleration for IPsec VPN processing, but this feature is not enabled by default. Enabling hardware acceleration offloads cryptographic operations to dedicated hardware, significantly improving throughput for large file transfers without requiring hardware upgrades or reducing security. Since the VPN tunnel bandwidth is underutilized and CPU is moderate, the bottleneck is likely software-based encryption, which hardware acceleration directly addresses.
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.
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.
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 →
Last reviewed: Jun 25, 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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