PCNSA Securing Traffic Practice Question
A company uses Palo Alto Networks firewall and wants to configure NAT to allow internal users to access the internet using a public IP address pool. Which NAT type should be used?
⚠ Common exam trap
PCNSA often tests the confusion between source NAT and destination NAT; the trap is that DIPP is source NAT for outbound traffic, while port forwarding and static NAT are destination NAT for inbound 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
✓
Dynamic IP and Port (DIPP) with source NAT.
Dynamic IP and Port (DIPP) with source NAT is the correct choice because it translates multiple internal IP addresses to a pool of public IP addresses while also translating source ports, allowing many internal users to share a small public IP pool. This is the standard Palo Alto Networks configuration for outbound internet access from internal users.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Dynamic IP and Port (DIPP) with source NAT.
Why this is correct
Dynamic IP and Port source NAT translates many internal sessions to a pool of public addresses using unique source ports, allowing internet-bound traffic to share the public IP pool. This matches the requirement for outbound user access via a public address pool rather than static one-to-one mapping.
- ✗
Bidirectional NAT.
Why it's wrong here
Bidirectional NAT combines destination and source translation for traffic in both directions, which is unnecessary for outbound-only internet access. It is tempting because it handles both directions, but it is correct when inbound and outbound translation must occur together, not for a shared public pool.
- ✗
Static NAT with source NAT.
Why it's wrong here
Static NAT maps one private address to one fixed public address, so a pool cannot be shared by many internal users. It is tempting because static NAT suits inbound publishing of servers, but outbound internet access from many hosts requires dynamic IP and port (source) NAT.
- ✗
Destination NAT with port forwarding.
Why it's wrong here
Destination NAT with port forwarding translates inbound traffic to an internal server, so it cannot provide outbound internet access for internal users. It is tempting because it also uses a public address, but it is correct only for publishing internal services to external clients.
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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.