NSE7 Enterprise Firewall and VDOMs Practice Question
A network administrator is configuring inter-VDOM routing between two VDOMs: VDOM-A and VDOM-B. The administrator creates a inter-VDOM link and adds routes pointing to the link. However, traffic from VDOM-A to VDOM-B fails. What is the most likely missing configuration?
⚠ Common exam trap
Many exam-takers assume routing alone is sufficient for inter-VDOM communication, overlooking FortiGate's requirement for explicit firewall policies to permit traffic across VDOM boundaries, similar to how policies are needed between physical interfaces.
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
✓
A firewall policy must be created in each VDOM to permit traffic across the inter-VDOM link
In FortiGate, inter-VDOM routing requires firewall policies in each VDOM to explicitly permit traffic across the inter-VDOM link. Without these policies, the FortiGate drops the traffic even if routes are correctly configured, because the inter-VDOM link behaves like a virtual interface that requires policy-based access control.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both VDOMs must be in transparent mode
Why it's wrong here
Inter-VDOM links operate between VDOMs in NAT or route mode; transparent mode prevents the link from routing between them. It is tempting because transparent mode is a legitimate FortiGate VDOM operating mode, but it is used for bridging, not inter-VDOM routing.
- ✓
A firewall policy must be created in each VDOM to permit traffic across the inter-VDOM link
Why this is correct
Inter-VDOM links carry traffic between VDOMs, but FortiGate still evaluates security policies on each side. Without a firewall policy in VDOM-A and VDOM-B permitting traffic across the link, the implicit deny drops packets, so routes alone are insufficient.
- ✗
The inter-VDOM link must be in the same VDOM
Why it's wrong here
An inter-VDOM link inherently spans two VDOMs, with one endpoint interface in each; placing it in a single VDOM defeats its purpose. It is tempting because interfaces normally belong to one VDOM, so the requirement appears to follow that convention.
- ✗
The management VDOM must be enabled
Why it's wrong here
The management VDOM governs administrative access, not data-plane routing between VDOMs, so enabling it changes nothing here. It is tempting because management VDOM configuration is a common FortiGate task, but it is unrelated to forwarding traffic across an inter-VDOM link.
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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.