easyMultiple Choice
PCNSA Practice Question: Ensure that all traffic from the internet to…
A company wants to ensure that all traffic from the internet to their internal web server is inspected for threats. Which configuration component is essential to achieve this?
⚠ Common exam trap
Many exam-takers confuse the necessity of NAT or SSL decryption as the primary component for threat inspection, overlooking that the security policy rule with a threat prevention profile is the actual enforcement point for inspecting traffic.
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
✓
A security policy rule that allows traffic from the internet zone to the DMZ zone and has a threat prevention profile attached.
A security policy rule that allows traffic from the internet zone to the DMZ zone with a threat prevention profile attached is the essential component to inspect all traffic from the internet to the internal web server for threats. The threat prevention profile enables the firewall to perform intrusion prevention system (IPS) and antivirus inspection on the allowed traffic, ensuring malicious content is blocked. Without this profile, traffic would be permitted but not inspected for threats, failing the requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Destination NAT policy to translate the public IP to the internal server.
Why it's wrong here
Destination NAT merely translates the public IP to the internal server, permitting inbound reachability; it performs no threat inspection. It tempts because DNAT is required for internet clients to reach an internal web server at all, but the question asks specifically for the component that inspects that traffic.
- ✗
SSL decryption policy to decrypt traffic to the web server.
Why it's wrong here
SSL decryption only decrypts TLS sessions so the firewall can examine their contents; it does not itself enforce threat inspection on inbound web traffic. It tempts because inspecting encrypted traffic requires decryption, but the essential component is the security policy applying threat profiles to that traffic.
- ✓
A security policy rule that allows traffic from the internet zone to the DMZ zone and has a threat prevention profile attached.
Why this is correct
Threat inspection only occurs when traffic traverses a security policy rule with a threat prevention profile attached. Permitting internet-to-DMZ traffic alone would pass it uninspected, so the profile on that inter-zone rule is the essential component.
- ✗
A QoS policy to prioritize web traffic.
Why it's wrong here
QoS classifies and prioritises bandwidth; it neither permits nor inspects traffic, so it cannot ensure threat inspection. It tempts because QoS policies reference the same traffic and appear in the policy list, but prioritisation is a performance control, not a security inspection mechanism.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.