Quick Answer
The answer is the server’s certificate and its corresponding private key. For inbound inspection decryption, the firewall must act as a TLS proxy, terminating the client’s encrypted session and re-encrypting traffic to the protected server. Without the private key, the firewall cannot decrypt the incoming TLS handshake or inspect the payload, making the certificate alone useless. On the Palo Alto Networks PCNSA exam, this concept tests your understanding of how decryption policies differ between inbound and outbound scenarios—a common trap is confusing inbound inspection with SSL forward proxy, which uses a locally generated certificate. Remember that inbound decryption requires you to import the actual server’s private key, not just a CA-signed certificate. A useful memory tip: “Inbound needs the key to see the inbound traffic.”
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?
The client's certificate.
Why wrong: Client certificates are used for client authentication.
The server's certificate and private key.
Inbound inspection needs the server's private key to decrypt traffic.
A trusted CA certificate from the enterprise PKI.
Why wrong: This is required for forward proxy decryption, not inbound inspection.
The firewall's own self-signed certificate.
Why wrong: Self-signed certificates are not trusted by clients.
Answer choices
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
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
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Decryption and Monitoring — This question tests Decryption and Monitoring — Read the scenario before looking for a memorised answer..
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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