NSE7 Enterprise Firewall and VDOMs Practice Question
A FortiGate running FortiOS 7.2 has multiple VDOMs. The administrator notices that inter-VDOM routing between two VDOMs is not working. Configuration shows a firewall policy allowing the traffic, and the route table shows routes to the destination VDOM. What additional configuration is required?
⚠ Common exam trap
Many candidates assume a firewall policy and routes are sufficient for inter-VDOM traffic, overlooking the mandatory VDOM link interface pair that provides the actual Layer 3 adjacency between the 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
✓
Create a VDOM link interface pair and assign them to the respective VDOMs
Inter-VDOM routing requires a VDOM link, which is a pair of logical interfaces (one in each VDOM) that are directly connected. Without this link, the VDOMs cannot exchange traffic even if firewall policies and routes exist, because they operate as separate virtual firewalls with isolated forwarding tables.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a static route with a gateway IP in the destination VDOM
Why it's wrong here
Inter-VDOM links are point-to-point; adding a gateway IP static route is unnecessary and wrong. It tempts because static routes with next-hop gateways are normal for routed interfaces, but VDOM links route directly once the link and firewall policy exist.
- ✓
Create a VDOM link interface pair and assign them to the respective VDOMs
Why this is correct
Inter-VDOM traffic requires a VDOM link, a virtual interface pair whose ends sit in each VDOM, to carry packets between them. Routes and a permissive policy alone cannot forward traffic without this link, so the missing link explains the failure.
- ✗
Assign an IP address to the VLAN interface on the source VDOM
Why it's wrong here
A VDOM link is a virtual interface, not a VLAN, so assigning a VLAN interface IP on the source VDOM does not enable inter-VDOM routing. It tempts because interface IPs are needed for routing generally, but the missing piece is the inter-VDOM link itself.
- ✗
Enable 'inter-vdom' under config system global
Why it's wrong here
There is no 'inter-vdom' setting under config system global; inter-VDOM routing is enabled by creating VDOM links and policies. It tempts because global toggles exist for other features, but FortiOS 7.2 requires explicit VDOM link interfaces instead.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet 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 NSE7 exam.