The answer is explicit proxy with SSL Forward Proxy decryption. This deployment method is correct because it requires clients to be manually configured to send HTTP traffic to the firewall’s proxy IP, allowing the firewall to terminate the client connection, perform SSL Forward Proxy decryption using a forward trust certificate, and then re-encrypt the traffic for inspection before forwarding it to the next-generation firewall for policy enforcement. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this question tests your understanding of how SSL Forward Proxy deployment methods differ from transparent proxy setups, where clients are unaware of the proxy. A common trap is confusing explicit proxy with transparent proxy, which does not require client configuration but cannot guarantee decryption of all internet-bound HTTP traffic. Remember the memory tip: “Explicit means the client knows it’s being proxied; transparent means the client is blissfully unaware.”
PCNSA Core Concepts Practice Question
This PCNSA practice question tests your understanding of core concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 wants to ensure that all internet-bound HTTP traffic is decrypted for inspection before being forwarded to the next-generation firewall for policy enforcement. Which deployment method should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Explicit proxy with SSL Forward Proxy decryption
B is correct because an explicit proxy deployment requires clients to be configured to send HTTP traffic to the firewall's proxy IP, which allows the firewall to terminate the client connection, perform SSL Forward Proxy decryption using a forward trust certificate, and then re-encrypt the traffic for inspection before forwarding it to the next-generation firewall for policy enforcement. This method ensures that all internet-bound HTTP traffic is decrypted for inspection, as the firewall acts as an intermediary between the client and the destination server.
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.
✗
Virtual wire mode with SSL Forward Proxy
Why it's wrong here
Virtual wire mode is transparent and does not support SSL decryption.
✓
Explicit proxy with SSL Forward Proxy decryption
Why this is correct
Explicit proxy mode lets the firewall act as a forward proxy and perform SSL decryption for inspection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Transparent proxy with a forward trust certificate
Why it's wrong here
Transparent proxy intercepts traffic without explicit configuration but SSL decryption still requires an explicit proxy configuration.
✗
Layer 3 mode with a policy-based forwarding rule
Why it's wrong here
Policy-Based Forwarding can redirect traffic but does not enable SSL decryption automatically.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the misconception that transparent proxy or virtual wire mode can perform SSL decryption without explicit client configuration, but the trap here is that only explicit proxy with SSL Forward Proxy decryption guarantees the firewall can terminate and decrypt all HTTP traffic as an intermediary, whereas other modes require additional configuration or lack the ability to act as a proxy endpoint.
Detailed technical explanation
How to think about this question
In an explicit proxy deployment, the firewall acts as an HTTP proxy, and clients must be configured to use the firewall's IP address and port (e.g., 8080) for HTTP requests. When SSL Forward Proxy decryption is enabled, the firewall generates a forward trust certificate that is installed on clients, allowing it to intercept HTTPS traffic by performing a man-in-the-middle (MITM) decryption, where it decrypts the client's request, inspects the content, and then re-encrypts the traffic to the destination server. This ensures that all internet-bound HTTP and HTTPS traffic is decrypted for inspection before policy enforcement, which is critical for detecting threats like malware or data exfiltration in encrypted traffic.
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.
Core Concepts — This question tests Core Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Explicit proxy with SSL Forward Proxy decryption — B is correct because an explicit proxy deployment requires clients to be configured to send HTTP traffic to the firewall's proxy IP, which allows the firewall to terminate the client connection, perform SSL Forward Proxy decryption using a forward trust certificate, and then re-encrypt the traffic for inspection before forwarding it to the next-generation firewall for policy enforcement. This method ensures that all internet-bound HTTP traffic is decrypted for inspection, as the firewall acts as an intermediary between the client and the destination server.
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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