- A
The IPsec tunnel between branches is configured with a higher metric than the tunnel to the central firewall.
Why wrong: Higher metric makes the direct path less preferred, opposite of observed behavior.
- B
The security policy rules are not in the correct order; a rule allowing direct traffic is matched first.
Why wrong: Policies are confirmed correct, so rule order is not the issue.
- C
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 wrong: Higher AD would make the direct route less preferred, not more.
- D
The route-based VPN tunnels are using static routes that are more specific than the routes advertised by the central firewall.
More specific static routes take precedence over less specific dynamic routes, causing direct traffic.
Quick Answer
The answer is that the route-based VPN tunnels are using static routes with more specific prefixes than the routes advertised by the central firewall. This occurs because in route-based VPNs, the firewall’s forwarding decision is driven by the routing table, where a more specific static route (e.g., a /24 for a branch subnet) always takes precedence over a less specific route (e.g., a /16 summary) regardless of administrative distance or metric. On the PCNSA exam, this scenario tests your understanding of how static routes can bypass security policy when they create a more direct path—a common trap where candidates assume security policies alone control traffic flow, forgetting that routing decisions happen first. The key insight is that the firewall inspects traffic only after the route is selected, so a more specific static route to the remote branch’s IPsec tunnel sends packets directly, avoiding the central firewall entirely. Memory tip: think “more specific wins the route, not the policy”—the longest prefix match always overrides security intent.
PCNSA Policy Evaluation and Management Practice Question
This PCNSA practice question tests your understanding of policy evaluation and management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that 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.
Detailed technical explanation
How to think about this question
In PAN-OS route-based VPNs, the firewall uses the routing table to determine the next hop and egress interface. Static routes have an administrative distance of 10 by default, while routes learned via OSPF or BGP have higher ADs (e.g., 110 or 20). However, prefix length (specificity) overrides AD: a /24 static route is always preferred over a /16 dynamic route, even if the dynamic route has a lower AD. This is a fundamental IP routing principle (longest prefix match). In real-world scenarios, this often occurs when branch subnets are summarized at the datacenter but configured with exact /24 static routes on each branch, causing traffic to bypass the central firewall.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the PCNSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Policy Evaluation and Management — This question tests Policy Evaluation and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this PCNSA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 25, 2026
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.
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