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NSE4 · Question #431

Which of the following statements is correct regarding FortiGate interfaces and spanning tree protocol? (Choose Two)

The correct answer is B. All FortiGate interfaces in transparent mode VDOMs participate in spanning tree. D. All FortiGate interfaces in transparent mode VDOMs may block or forward BPDUs. This question tests understanding of how FortiGate interfaces interact with Spanning Tree Protocol (STP), particularly in different VDOM modes.

Submitted by packet_pusher· Apr 18, 2026FortiGate Deployment and System Configuration

Question

Which of the following statements is correct regarding FortiGate interfaces and spanning tree protocol? (Choose Two)

Options

  • AOnly FortiGate switch interfaces Participate in spanning tree.
  • BAll FortiGate interfaces in transparent mode VDOMs participate in spanning tree.
  • CAll FortiGate interfaces in NAT/route mode VDOMs Participate in spanning tree.
  • DAll FortiGate interfaces in transparent mode VDOMs may block or forward BPDUs.

How the community answered

(37 responses)
  • A
    3% (1)
  • B
    89% (33)
  • C
    8% (3)

Why each option

This question tests understanding of how FortiGate interfaces interact with Spanning Tree Protocol (STP), particularly in different VDOM modes.

AOnly FortiGate switch interfaces Participate in spanning tree.

The statement is incorrect because interfaces in transparent mode VDOMs also participate in STP, not only dedicated switch interfaces.

BAll FortiGate interfaces in transparent mode VDOMs participate in spanning tree.Correct

All FortiGate interfaces configured within transparent mode VDOMs participate in Spanning Tree Protocol to prevent network loops, as a transparent mode FortiGate acts as a Layer 2 bridge.

CAll FortiGate interfaces in NAT/route mode VDOMs Participate in spanning tree.

FortiGate interfaces in NAT/Route mode VDOMs operate at Layer 3 and do not typically participate directly in Layer 2 Spanning Tree Protocol, as their primary function is routing, not bridging.

DAll FortiGate interfaces in transparent mode VDOMs may block or forward BPDUs.Correct

Interfaces in transparent mode VDOMs are capable of processing and, depending on configuration, blocking or forwarding Bridge Protocol Data Units (BPDUs) to actively participate in the STP domain.

Concept tested: FortiGate transparent mode and STP

Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/469279/spanning-tree-protocol

Topics

#Spanning Tree Protocol#FortiGate Transparent Mode#Network Interfaces#VDOMs

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