Exam NGFW-Engineer Topic 1 Question 124 Discussion

Actual exam question for Palo Alto Networks's NGFW-Engineer exam
Question #: 124
Topic #: 1
An administrator is troubleshooting a newly configured site-to-site VPN between a PAN-OS firewall and a third-party policy-based VPN gateway. The tunnel allows traffic between the first pair of configured subnets, but traffic to a newly added remote subnet is failing. The administrator has confirmed that routing and Security policies are correct.
What is the most likely cause of this issue?

Suggested Answer: C Vote an answer

With a policy-based VPN, Phase 2 traffic selectors must explicitly include each permitted local and remote subnet pair. If the new subnet pair was added in routing and policy but not added to the Proxy ID configuration, the peer will not negotiate selectors for that traffic, so the new subnet traffic fails while the original subnet continues to work.

by Myron at Mar 21, 2026, 02:48 PM

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