NSE4 System and Network Administration Practice Question
Which FortiGate operating mode allows the device to act as a transparent layer 2 bridge, forwarding traffic without performing NAT or routing?
⚠ Common exam trap
Many exam-takers confuse 'transparent mode' with 'VDOM mode' because VDOMs can be configured in transparent mode, but VDOM mode itself is a virtualization feature, not the operating mode that defines Layer 2 bridging behavior.
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
✓
Transparent mode
Transparent mode is the correct answer because in this mode, FortiGate operates as a Layer 2 bridge, forwarding traffic based on MAC addresses without performing Network Address Translation (NAT) or routing. The device does not have an IP address on its interfaces for forwarding decisions, making it invisible to the network at Layer 3.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transparent mode
Why this is correct
Transparent mode acts as a layer 2 bridge.
- ✗
HA mode
Why it's wrong here
HA mode is for high availability, not a separate operating mode.
- ✗
VDOM mode
Why it's wrong here
VDOM mode is a virtualization feature, not an operating mode.
- ✗
NAT/Route mode
Why it's wrong here
NAT/Route mode performs routing and NAT.
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 NSE4 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 NSE4 exam.