NSE 4 – FortiGate 7.0 — Question 47

FortiGate is operating in NAT mode and is configured with two virtual LAN (VLAN) subinterfaces added to the same physical interface.
In this scenario, which statement about the VLAN IDs is true?

Answer options

• A. The two VLAN subinterfaces can have the same VLAN ID only if they have IP addresses in the same subnet.
• B. The two VLAN subinterfaces can have the same VLAN ID only if they have IP addresses in different subnets.
• C. The two VLAN subinterfaces can have the same VLAN ID only if they belong to different VDOMs.
• D. The two VLAN subinterfaces must have different VLAN IDs.

Correct answer: D

Explanation

The correct answer is D because each VLAN subinterface must have its own unique VLAN ID to properly segregate traffic and avoid conflicts. Options A, B, and C are incorrect as they suggest scenarios where VLAN IDs can be reused, which is not permissible in this configuration.