NSE7 Enterprise Firewall and VDOMs Practice Question
A FortiGate is configured with multiple VDOMs. The administrator wants to assign a specific physical interface to a non-management VDOM and ensure that the interface is not visible or configurable from other VDOMs. The interface is currently assigned to the root VDOM. What is the correct procedure to reassign the interface to VDOM-1?
⚠ Common exam trap
The trap here is thinking that changing the VDOM assignment automatically cleans up references or that you can edit the interface from the target VDOM, when in fact you must manually remove references from the current VDOM first.
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
✓
In the root VDOM, remove all references to the interface (such as firewall policies and routing entries), then use the global configuration to set the interface's VDOM to VDOM-1.
Reassigning a physical interface to a different VDOM requires removing all references to that interface in its current VDOM, such as firewall policies, routes, and DHCP settings. Once the interface is free of references, you can change its VDOM assignment in the global configuration. This process ensures that the interface is cleanly moved and becomes exclusively available to the target VDOM, maintaining proper isolation between VDOMs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
In the global configuration, directly change the interface's VDOM to VDOM-1; the FortiGate automatically deletes all references in the root VDOM.
Why it's wrong here
The FortiGate does not automatically delete references such as firewall policies or routes when you change an interface's VDOM. If references exist, the change will fail with an error. You must manually remove all references first. Attempting to change the VDOM assignment while references exist will result in a configuration error, and the interface will remain in the root VDOM.
- ✓
In the root VDOM, remove all references to the interface (such as firewall policies and routing entries), then use the global configuration to set the interface's VDOM to VDOM-1.
Why this is correct
To move a physical interface from one VDOM to another, you must first remove any configuration that references the interface in its current VDOM, such as firewall policies, routes, and DHCP server settings. Then, in the global configuration, you can change the interface's VDOM assignment. This ensures that the interface is cleanly detached before being reassigned. After reassignment, the interface becomes visible only in the target VDOM.
- ✗
From VDOM-1, use the command 'config system interface' and edit the interface, then set its VDOM to VDOM-1. The FortiGate automatically removes it from the root VDOM.
Why it's wrong here
You cannot edit an interface from a VDOM where it is not currently assigned. The interface is only visible in the VDOM it belongs to. To move it, you must operate from the global configuration or from the current VDOM after removing references. Simply editing it from VDOM-1 is not possible because the interface does not appear in that VDOM's interface list until it is assigned. The FortiGate does not automatically remove it from the root VDOM.
- ✗
Create a new VDOM link between the root VDOM and VDOM-1, then bridge the physical interface to the VDOM link so that VDOM-1 can use it without reassigning the interface.
Why it's wrong here
Bridging a physical interface to a VDOM link is not a supported method to give another VDOM access to that interface. VDOM links are routed interfaces, not Layer 2 bridges, and they do not make a physical interface appear in another VDOM. To assign a physical interface to a VDOM, you must reassign it properly. Bridging would not provide the desired isolation or visibility.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Fortinet exam blueprint
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.