mediumMultiple Choice
PCNSA Practice Question: Users report that some internal services are not…
Users report that some internal services are not accessible when connected via VPN, but they work when on the local network. The firewall has a policy allowing all traffic from the VPN zone to the internal zone. What should the administrator check first?
⚠ Common exam trap
The trap is assuming the security policy is the only factor — candidates often overlook NAT, but the exam tests whether you check NAT rules (especially reverse NAT) when VPN traffic fails while local traffic works.
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
✓
Check if there are NAT rules that affect the VPN zone traffic, such as missing reverse NAT.
When internal services work on the local network but fail over VPN, and the security policy allows VPN-to-internal traffic, the most likely culprit is NAT. If the VPN zone traffic is being source-NATed (e.g., to an interface IP) or if reverse NAT is missing for return traffic, the internal servers may not have a route back or may reject the connection. Checking NAT rules affecting the VPN zone, including reverse NAT, is the first logical step.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check if SSL decryption is breaking the traffic.
Why it's wrong here
Decryption is likely not applied to internal-to-internal traffic.
- ✓
Check if there are NAT rules that affect the VPN zone traffic, such as missing reverse NAT.
Why this is correct
NAT is evaluated before security policy, so a translation rule matching VPN-zone traffic can rewrite source or destination addresses and break return paths. Verifying NAT rules, including missing reverse translation for the internal zone, is the first check.
- ✗
Check if the zone protection profile is dropping traffic.
Why it's wrong here
Zone protection profiles are for flood protection, etc., and would not selectively block specific services.
- ✗
Check if the security policy rule order is correct.
Why it's wrong here
If an allow rule exists, order typically doesn't cause denial unless there is a deny rule above it.
Visual reference
Go deeper
Related to this question
About these practice questions
This PCNSA question is part of Courseiva's 385-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 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.