PCNSE Core Concepts and Architecture Practice Question
A security engineer is configuring a Palo Alto Networks firewall to decrypt outbound SSL traffic for inspection. The firewall is deployed in a forward proxy mode. The engineer wants to ensure that the firewall can decrypt traffic without generating certificate errors on client browsers. Which configuration is required to achieve this?
⚠ Common exam trap
Test-takers frequently confuse the roles of the forward trust and forward untrust certificates; the forward trust certificate must be trusted by clients, while the forward untrust certificate is used when the server certificate is untrusted.
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
✓
Install the forward trust certificate on the firewall and distribute it to all client devices as a trusted root CA certificate.
In SSL forward proxy decryption, the firewall acts as a man-in-the-middle, decrypting traffic, inspecting it, and re-encrypting it. To prevent certificate warnings, the firewall uses a forward trust certificate to sign the certificates it presents to clients. For clients to trust these certificates, the forward trust certificate must be installed as a trusted root CA on each client device. This is a fundamental requirement for transparent SSL decryption without user disruption.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Install the forward trust certificate on the firewall and distribute the forward untrust certificate to all client devices.
Why it's wrong here
The forward trust certificate is used by the firewall to sign re-encrypted traffic to clients, while the forward untrust certificate is presented to clients when the original server certificate cannot be validated. Distributing the forward untrust certificate to clients is not necessary for avoiding certificate errors; instead, the forward trust certificate must be trusted by clients.
- ✗
Install the forward untrust certificate on the firewall and distribute the forward trust certificate to all client devices.
Why it's wrong here
The forward untrust certificate is used when the firewall cannot validate the server certificate, and it is presented to clients to indicate an untrusted connection. It is not used for signing re-encrypted traffic. Distributing the forward trust certificate to clients is correct, but installing the forward untrust certificate on the firewall is not the primary requirement for avoiding certificate errors.
- ✓
Install the forward trust certificate on the firewall and distribute it to all client devices as a trusted root CA certificate.
Why this is correct
For SSL forward proxy decryption, the firewall uses the forward trust certificate to generate a certificate for each server and sign it. For clients to trust this dynamically generated certificate, the forward trust certificate must be installed as a trusted root CA on the client devices. This prevents certificate errors and allows decryption to occur seamlessly.
- ✗
Install the forward trust certificate on the firewall and configure the clients to use the firewall as a proxy server for all SSL connections.
Why it's wrong here
Configuring clients to use the firewall as a proxy server is not required for SSL forward proxy decryption. The firewall intercepts traffic transparently based on decryption policy. The key requirement is that the forward trust certificate is trusted by clients, not that clients are configured with an explicit proxy setting.
Go deeper
Related to this question
About these practice questions
This PCNSE question is part of Courseiva's 319-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Palo Alto Networks exam blueprint
This PCNSE 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 PCNSE exam.