NSE7 Advanced Networking and SD-WAN Practice Question
An administrator wants to integrate a FortiExtender with a FortiGate to provide additional WAN connectivity. Which configuration is required on the FortiGate to enable the FortiExtender to operate as a secondary WAN interface?
⚠ Common exam trap
Test-takers frequently assume bridge mode is required to integrate the FortiExtender, but in reality, bridge mode is used only for specific passthrough scenarios (e.g., extending a LAN segment), while the default routed mode is what enables it as a secondary WAN interface with its own NAT and gateway capabilities.
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
✓
Configure the FortiExtender under Network > FortiExtender and assign it to a WAN interface
When a FortiExtender is configured under Network > FortiExtender and assigned to a WAN interface, the FortiGate treats it as a secondary WAN link, allowing it to participate in SD-WAN or load-balancing policies. The FortiExtender operates in its default routed mode, where it receives a public IP from the cellular network and the FortiGate uses it as an additional gateway for outbound traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the FortiExtender under Network > FortiExtender and assign it to a WAN interface
Why this is correct
The FortiGate creates a virtual interface for the FortiExtender.
- ✗
Enable LLDP on the port connected to the FortiExtender
Why it's wrong here
LLDP is for discovery, not configuration.
- ✗
Set the FortiExtender to bridge mode
Why it's wrong here
Bridge mode is an option on the device, not a FortiGate configuration.
- ✗
Create a VLAN interface for the FortiExtender
Why it's wrong here
VLAN is not used; FortiExtender uses a dedicated extension interface.
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