PCNSA Policy Evaluation and Management Practice Question
A company has multiple branch offices connected via IPsec tunnels to a central datacenter. The central datacenter has a PA-5250 running PAN-OS 10.1. The security team wants to enforce that traffic between branches is inspected by the central firewall, not directly between branches. They configure security policies to allow inter-branch traffic through the central firewall. However, they notice that traffic between two branches (Branch A and Branch B) is not traversing the central firewall and is instead going directly between the branches via the IPsec tunnels which are configured as route-based VPNs. The security team has verified that the security policies are correctly configured to require the traffic to go through the central datacenter. What is the most likely cause?
⚠ Common exam trap
Many candidates confuse routing table preference (longest prefix match and administrative distance) with security policy evaluation order, assuming that correctly ordered policies guarantee traffic inspection without considering that the firewall must first route the traffic to itself.
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
✓
The route-based VPN tunnels are using static routes that are more specific than the routes advertised by the central firewall.
The most likely cause is that the route-based VPN tunnels between branches use static routes with a more specific prefix (e.g., /24) than the routes advertised by the central firewall (e.g., /16). In route-based VPNs, the firewall makes forwarding decisions based on the routing table; more specific routes have a higher priority regardless of administrative distance or metric. Therefore, Branch A's traffic destined for Branch B matches the more specific static route pointing directly to Branch B's IPsec tunnel, bypassing the central firewall despite security policies requiring inspection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The IPsec tunnel between branches is configured with a higher metric than the tunnel to the central firewall.
Why it's wrong here
Higher metric makes the direct path less preferred, opposite of observed behavior.
- ✗
The security policy rules are not in the correct order; a rule allowing direct traffic is matched first.
Why it's wrong here
Policies are confirmed correct, so rule order is not the issue.
- ✗
The route-based VPN tunnels between branches are in the same virtual router and have a higher administrative distance than the central tunnel, causing a routing loop.
Why it's wrong here
Higher AD would make the direct route less preferred, not more.
- ✓
The route-based VPN tunnels are using static routes that are more specific than the routes advertised by the central firewall.
Why this is correct
More specific static routes take precedence over less specific dynamic routes, causing direct traffic.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
Go deeper
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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.