NSE7 Enterprise Firewall and VDOMs Practice Question
An enterprise uses multiple VDOMs on a FortiGate. The administrator needs to route traffic between VDOM-A and VDOM-B using a firewall policy. What is the correct configuration step?
⚠ Common exam trap
It's easy for candidates to assume inter-VDOM routing is automatic or can be achieved with static routes alone, but FortiGate requires an explicit VDOM link or inter-VDOM link to pass traffic between VDOMs through firewall policies.
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
✓
Configure a VDOM link between the two VDOMs and create a policy allowing traffic
A VDOM link creates a direct Layer 2 or Layer 3 connection between two VDOMs, allowing traffic to be controlled by firewall policies. This is the only method that enables policy-based inter-VDOM routing without requiring external cables or complex routing configurations.
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 both VDOMs in the same virtual router and use regular policies
Why it's wrong here
Inter-VDOM routing requires a VDOM link (or physical interface) between the VDOMs; a shared virtual router cannot span separate VDOM routing tables. Placing both in one VDOM would work, but that defeats the segmentation the design requires.
- ✗
Create a static route in each VDOM pointing to the other VDOM's virtual interface
Why it's wrong here
Inter-VDOM links are preconfigured virtual interfaces, not routes; a static route pointing at another VDOM's interface cannot resolve without an inter-VDOM link pair first. Static routes are tempting because they direct traffic between distinct networks, which is exactly their purpose once the link exists.
- ✓
Configure a VDOM link between the two VDOMs and create a policy allowing traffic
Why this is correct
A VDOM link provides the physical-style interconnect carrying traffic between VDOM-A and VDOM-B, since separate VDOMs have isolated routing tables. The firewall policy then permits that inter-VDOM traffic, satisfying the requirement to route between them.
- ✗
Enable inter-VDOM routing globally under system settings
Why it's wrong here
No global toggle enables inter-VDOM routing; the administrator must create an inter-VDOM link and reference it in each VDOM's firewall policy. A global setting is tempting because many FortiGate features are enabled centrally, but inter-VDOM traffic requires explicit link interfaces.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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