NSE7 Enterprise Firewall and VDOMs Practice Question
In a multi-VDOM deployment, an administrator needs to route traffic between VDOM-A and VDOM-B. The administrator creates a VDOM link between the two VDOMs. What additional configuration is required on each VDOM to enable inter-VDOM traffic?
⚠ Common exam trap
Test-takers frequently assume a VDOM link alone provides full connectivity, forgetting that FortiOS requires explicit routing and firewall policies on both sides of the link to actually forward traffic between VDOMs.
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 static route on each VDOM pointing to the other VDOM's networks via the VDOM link, and create a firewall policy allowing traffic
Inter-VDOM traffic via a VDOM link requires both a static route on each VDOM pointing to the remote VDOM's networks through the VDOM link interface, and a firewall policy on each VDOM that permits the desired traffic. Without the static route, the VDOM does not know how to reach the other VDOM's subnets; without the firewall policy, traffic is blocked by the implicit deny rule. The VDOM link itself provides the Layer 2 or Layer 3 connectivity between the VDOMs, but routing and policy enforcement are mandatory for traffic to flow.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Only a firewall policy on VDOM-A allowing traffic to VDOM-B
Why it's wrong here
Policies are needed on both sides to allow return traffic, and routes are also required.
- ✗
Assign the VDOM link interfaces to the same VDOM
Why it's wrong here
The link interfaces belong to different VDOMs; assigning them to the same VDOM defeats the purpose.
- ✗
Enable 'inter-vdom-routing' under system settings only
Why it's wrong here
Inter-VDOM routing is a global setting but does not replace the need for policies and routes.
- ✓
Configure a static route on each VDOM pointing to the other VDOM's networks via the VDOM link, and create a firewall policy allowing traffic
Why this is correct
Routes direct traffic to the VDOM link, and policies permit the traffic. Both are needed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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