- A
The client's certificate.
Why wrong: Client certificates are used for client authentication.
- B
The server's certificate and private key.
Inbound inspection needs the server's private key to decrypt traffic.
- C
A trusted CA certificate from the enterprise PKI.
Why wrong: This is required for forward proxy decryption, not inbound inspection.
- D
The firewall's own self-signed certificate.
Why wrong: Self-signed certificates are not trusted by clients.
Question 298 of 529
PCNSA Decryption and Monitoring Practice Question
This PCNSA practice question tests your understanding of decryption and monitoring. 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 firewall is configured for inbound inspection decryption. Which certificate must be installed on the firewall for this to work?
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
✓
The server's certificate and private key.
Inbound inspection decryption requires the firewall to act as a TLS proxy, intercepting and decrypting traffic destined for a protected server. To do this, the firewall must possess the server's certificate and its corresponding private key, allowing it to terminate the TLS connection from the client and re-encrypt traffic to the server. Without the private key, the firewall cannot decrypt the session.
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 client's certificate.
Why it's wrong here
Client certificates are used for client authentication.
- ✓
The server's certificate and private key.
Why this is correct
Inbound inspection needs the server's private key to decrypt traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A trusted CA certificate from the enterprise PKI.
Why it's wrong here
This is required for forward proxy decryption, not inbound inspection.
- ✗
The firewall's own self-signed certificate.
Why it's wrong here
Self-signed certificates are not trusted by clients.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse inbound inspection decryption with SSL forward proxy decryption, where the firewall uses its own certificate or a CA-signed certificate, leading them to incorrectly choose Option C or D.
Detailed technical explanation
How to think about this question
Inbound inspection decryption relies on the firewall performing a man-in-the-middle (MITM) role, where it presents the server's certificate to the client and uses the server's private key to decrypt the TLS session. This is distinct from SSL forward proxy, where the firewall generates a new certificate signed by a trusted CA. The firewall must have the private key imported via the 'certificate' and 'private-key' CLI commands or the management interface, and the decryption policy must match the server's IP and port.
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.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Decryption and Monitoring — This question tests Decryption and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The server's certificate and private key. — Inbound inspection decryption requires the firewall to act as a TLS proxy, intercepting and decrypting traffic destined for a protected server. To do this, the firewall must possess the server's certificate and its corresponding private key, allowing it to terminate the TLS connection from the client and re-encrypt traffic to the server. Without the private key, the firewall cannot decrypt the session.
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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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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