In the context of SD-WAN, the terms underlay and overlay are commonly used to categorize links.
Which two statements about underlay and overlay links are correct? (Choose two.)
Answer: A, E
You have a FortiGate configuration with three user-defined SD-WAN zones and two members in each of these zones. One SD-WAN member is no longer in use in health-check and SD-WAN rules. You want to delete it.
What happens if you delete the SD-WAN member from the FortiGate GUI?
Answer: A
An administrator creates a custom application signature to identify proprietary corporate traffic. This signature is utilized in an SD-WAN rule to steer the traffic to a high-speed MPLS link. However, the administrator observes that the traffic initially routes over the default broadband internet link before migrating to the MPLS link mid-session.
What is the fundamental limitation of using Application Control in SD-WAN rules that causes this?
Answer: A
Explanation:
✑ Core Concept: Application steering and application learning phases[cite: 1].
✑ Analysis: This reinforces a critical exam concept. TCP connections start with a SYN, SYN-ACK, ACK sequence (the three-way handshake). These packets contain no Layer 7 application data. Because Application Control requires analyzing the payload to identify the app, the FortiGate cannot know it is the “proprietary corporate traffic” during the first few packets. It routes these initial packets using standard IP-based routing. Once the payload is sent and the app is identified (the learning phase completes), the SD-WAN rule matches and steers subsequent packets to the MPLS link.
✑ CLI /Reference: Understanding Application Control First Packet vs Payload inspection.
In the context of SD-WAN, the terms underlay and overlay are commonly used to categorize links.
Which two statements about underlay and overlay links are correct? (Choose two.)
Correct Answer: A, E
You have a FortiGate configuration with three user-defined SD-WAN zones and two members in each of these zones. One SD-WAN member is no longer in use in health-check and SD-WAN rules. You want to delete it.
What happens if you delete the SD-WAN member from the FortiGate GUI?
Correct Answer: A





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