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PCNSA Practice Question: Has multiple virtual routers on a single firewall
An organization has multiple virtual routers on a single firewall. Traffic between two virtual routers must be inspected by security policies. How should this be configured?
⚠ Common exam trap
Many candidates assume static routes or a global setting can enable inter-VR traffic with security inspection, but they overlook that PAN-OS requires explicit zone-based security rules to inspect traffic between virtual routers.
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
✓
Place each virtual router's interfaces into different zones, then create inter-zone security rules.
Inter-zone security rules are required to enforce security policies on traffic between different virtual routers. Each virtual router's interfaces must be assigned to distinct zones, and inter-zone rules inspect traffic crossing from one zone to another, ensuring the firewall applies security controls (e.g., App-ID, User-ID) to the traffic between the virtual routers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Place each virtual router's interfaces into different zones, then create inter-zone security rules.
Why this is correct
Inter-zone traffic between virtual routers is inspected only when the source and destination interfaces sit in different zones. Assigning each virtual router's interfaces to separate zones forces the traffic through inter-zone security rules, satisfying the inspection requirement.
- ✗
Configure static routes between the virtual routers.
Why it's wrong here
Static routes only populate the routing table so packets can reach the other virtual router; they do not invoke security inspection, and traffic may pass uninspected. It is tempting because routing is a prerequisite for connectivity, but the requirement is inspection, which demands security policy rules between the relevant zones.
- ✗
Enable inter-virtual router routing under the global settings.
Why it's wrong here
No such global setting exists; inter-virtual router traffic is not enabled by a checkbox, and by default it is not inspected. It is tempting because global settings govern other firewall-wide behaviours, but routing between virtual routers requires security policy rules referencing the zones those routers serve, not a global toggle.
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Apply security policies that match the virtual router as a source or destination.
Why it's wrong here
Security policies match zones, addresses and applications, not virtual router names, so a virtual router cannot serve as source or destination in a rule. It is tempting because policy-based inspection is the correct mechanism, but the match criteria must reference the zones associated with each virtual router.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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