The correct answer is to configure the firewall to receive decrypted traffic from an external SSL decryptor on a specific zone. This deployment architecture, known as SSL decryption offloading to an external appliance, works by placing a dedicated decryptor upstream of the Palo Alto firewall; the decryptor handles the CPU-intensive SSL/TLS termination, then forwards the already-decrypted traffic to the firewall on a dedicated zone. The firewall can then inspect the plaintext payload using its security policies without performing decryption itself, which directly resolves the high CPU usage on the PA-5250. On the PCNSA exam, this scenario tests your understanding of how to scale decryption without overloading the firewall’s processing capacity—a common trap is assuming the firewall must always terminate SSL, but offloading preserves inspection capabilities while shifting the cryptographic workload. Remember the memory tip: “Decrypt elsewhere, inspect here” to recall that the external appliance handles the heavy lifting, and the firewall only receives decrypted traffic on a dedicated zone.
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. 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 organization is experiencing performance degradation on their PA-5250 firewall after enabling SSL decryption for all traffic. The firewall's CPU usage is consistently above 80%. The decision is made to offload SSL decryption to a dedicated appliance. Which deployment architecture allows the Palo Alto firewall to inspect decrypted traffic while the decryption occurs elsewhere?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the firewall to receive decrypted traffic from an external SSL decryptor on a specific zone.
Option B is correct because it describes a deployment where an external SSL decryptor handles the decryption, and the Palo Alto firewall receives the already-decrypted traffic on a dedicated zone. This offloads the CPU-intensive decryption process from the firewall, allowing it to inspect the decrypted payload using its security policies without performing SSL/TLS termination itself.
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 SSL proxy with certificate chaining to reduce CPU.
Why it's wrong here
This does not offload decryption; it still uses firewall resources.
✓
Configure the firewall to receive decrypted traffic from an external SSL decryptor on a specific zone.
Why this is correct
Receiving decrypted traffic from an external device allows inspection without performing decryption, offloading CPU.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a decryption broker that sends decrypted traffic to the firewall via a virtual wire.
Why it's wrong here
Palo Alto does not have a decryption broker; virtual wire is for transparent inline.
✗
Deploy a forward proxy where the firewall decrypts and then re-encrypts.
Why it's wrong here
This still requires the firewall to perform decryption, increasing load.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a decryption broker (option C) with an external SSL decryptor, but a decryption broker is used for service chaining and does not offload decryption from the firewall—it simply redirects traffic to multiple inline services.
Detailed technical explanation
How to think about this question
In this architecture, the external SSL decryptor terminates the TLS session, often using a private key or a trusted certificate, and forwards the plaintext traffic to the Palo Alto firewall over a dedicated zone (e.g., a 'decrypt' zone). The firewall then applies security policies, threat prevention, and URL filtering on the decrypted content without the overhead of TLS handshake and encryption/decryption. This is commonly used in high-throughput environments where the firewall's hardware-based decryption capacity is insufficient, and the external appliance can handle the cryptographic workload more efficiently.
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: Configure the firewall to receive decrypted traffic from an external SSL decryptor on a specific zone. — Option B is correct because it describes a deployment where an external SSL decryptor handles the decryption, and the Palo Alto firewall receives the already-decrypted traffic on a dedicated zone. This offloads the CPU-intensive decryption process from the firewall, allowing it to inspect the decrypted payload using its security policies without performing SSL/TLS termination itself.
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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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
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