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PCNSA · Question #310

Which two matching criteria are used when creating a Security policy involving NAT? (Choose two.)

The correct answer is A. Pre-NAT address D. Post-NAT zone. When creating a security policy involving NAT, the firewall uses the Pre-NAT address as the source matching criterion and the Post-NAT zone as the destination zone matching criterion.

Submitted by kev92· Apr 18, 2026Policy Evaluation and Management

Question

Which two matching criteria are used when creating a Security policy involving NAT? (Choose two.)

Options

  • APre-NAT address
  • BPost-NAT address
  • CPre-NAT zone
  • DPost-NAT zone

How the community answered

(24 responses)
  • A
    92% (22)
  • B
    4% (1)
  • C
    4% (1)

Why each option

When creating a security policy involving NAT, the firewall uses the Pre-NAT address as the source matching criterion and the Post-NAT zone as the destination zone matching criterion.

APre-NAT addressCorrect

Security policies are evaluated on the original (Pre-NAT) source IP address, as this represents the true identity of the initiator before any address translation occurs.

BPost-NAT address

Security policies are not matched on the post-NAT address, whether source or destination, because the policy engine needs to make decisions based on the packet's original source and its intended logical destination zone after translation.

CPre-NAT zone

Security policies use the source zone based on the original ingress interface, but for destination-based NAT, the destination zone is evaluated based on where the packet is intended to go *after* NAT, which is the post-NAT zone, not a pre-NAT zone.

DPost-NAT zoneCorrect

For destination NAT (DNAT), the security policy applies to the post-NAT destination zone because the packet is routed to that zone after its destination IP address is translated.

Concept tested: Security policy matching with NAT

Source: https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/nat/nat-policy/nat-rule-behavior-and-the-security-policy.html

Topics

#Security Policy#NAT#Policy Matching#Traffic Flow

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