NSE7 Enterprise Firewall and VDOMs Practice Question
During a security audit, it is found that traffic between two VDOMs is allowed even though no inter-VDOM routing policy is configured. The VDOMs are connected via a VDOM link. What could explain this behavior?
⚠ Common exam trap
Many exam-takers assume inter-VDOM traffic always requires a routing policy, forgetting that transparent mode bypasses Layer 3 routing entirely by operating at Layer 2.
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
✓
The VDOM link is operating in transparent mode
When a VDOM link operates in transparent mode, it acts as a Layer 2 bridge between the connected VDOMs. In transparent mode, the VDOM link does not require an inter-VDOM routing policy because traffic is forwarded based on MAC addresses rather than IP routing, effectively allowing all traffic between the VDOMs unless explicitly filtered by firewall policies. This explains why traffic flows even without a configured inter-VDOM routing policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The FortiGate is in NAT mode
Why it's wrong here
NAT mode does not bypass inter-VDOM routing policies.
- ✗
The VDOMs are in the same administrative domain
Why it's wrong here
Administrative domain is a FortiManager concept, not affecting traffic.
- ✗
The VDOM link is using the same interface IP
Why it's wrong here
Same IP would cause conflict, not allow traffic.
- ✓
The VDOM link is operating in transparent mode
Why this is correct
If the VDOM link is in transparent mode, it bridges traffic without routing, so inter-VDOM routing policies are not required.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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JA
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.