PCNSE Decryption and SSL Inspection Practice Question
This PCNSE practice question tests your understanding of decryption and ssl inspection. 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.
An organization is deploying SSL inbound proxy decryption (SSLi) to protect servers in a DMZ. Which consideration is critical for the firewall to properly decrypt inbound traffic destined to these servers?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The firewall must possess the server's private key to re-encrypt traffic.
In SSL inbound proxy decryption (SSLi), the firewall acts as a man-in-the-middle. To decrypt the client's encrypted request, it must terminate the TLS connection from the client. To then re-encrypt and forward the request to the destination server, the firewall needs the server's private key to generate a new TLS session with the server. Without the private key, the firewall cannot complete the re-encryption handshake with the server, making option C correct.
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.
✗
The firewall must present the server's public certificate to clients.
Why it's wrong here
The firewall presents its own certificate in inbound scenarios.
✗
The firewall must have a trusted CA certificate installed.
Why it's wrong here
That is for forward proxy decryption.
✓
The firewall must possess the server's private key to re-encrypt traffic.
Read the scenario before looking for a memorised answer.
✗
The firewall must be configured to only accept TLS 1.2 or higher.
Why it's wrong here
Not a critical requirement; versions are negotiated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse inbound decryption (where the firewall needs the server's private key) with outbound decryption (where the firewall needs a trusted CA certificate to generate certificates for clients), leading them to incorrectly select option B.
Trap categories for this question
Scenario analysis trap
The firewall presents its own certificate in inbound scenarios.
Detailed technical explanation
How to think about this question
Under the hood, SSLi works by the firewall terminating the client TLS connection, then initiating a new TLS connection to the server using the server's private key to authenticate. This requires the firewall to have the server's private key (or a copy) stored in its certificate store. In real-world deployments, the server's private key is often exported and imported into the firewall, or the firewall uses a subordinate CA to issue a certificate that the server trusts. A subtle behavior is that the firewall must also maintain session state to map the two TLS connections, ensuring the decrypted traffic is correctly re-encrypted.
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.
Decryption and SSL Inspection — This question tests Decryption and SSL Inspection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The firewall must possess the server's private key to re-encrypt traffic. — In SSL inbound proxy decryption (SSLi), the firewall acts as a man-in-the-middle. To decrypt the client's encrypted request, it must terminate the TLS connection from the client. To then re-encrypt and forward the request to the destination server, the firewall needs the server's private key to generate a new TLS session with the server. Without the private key, the firewall cannot complete the re-encryption handshake with the server, making option C correct.
What should I do if I get this PCNSE 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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