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 answers)

A. Overlay links provide routing flexibility.
B. Only wired connections can be used as underlay links.
C. A VLAN is a type of overlay link.
D. FortiLink interface is considered an underlay link.
E. Wireless connections can be used to build overlay links.

Correct Answer: A,E

Brave-Dump Clients Votes

AE 66.67%

AD 33.33%

Comments

Anonymous User 2026-09-05 00:34:01

Selected Answers: A, D

A and D arecorrect, becuase E is wrong wireless connection can be used as underlay

Ghayth 2026-09-19 11:50:23
Wireless connections can be used to build overlay links : This is the same of your comment, it says can be used to build overlay ( underlay can be used to build overlay)

Anonymous User 2026-09-05 00:34:19

Selected Answers: A, D

yes

Anonymous User 2026-09-07 14:56:27

Selected Answers: A, E

E is corect, its saying you can build overlay links over wireless connection instead of classifying it as overlay

Anonymous User 2026-09-09 10:40:58

Selected Answers: A, E

Overlay links provide routing flexibility by creating logical connections over one or more physical transport networks. In SD-WAN, they allow traffic to be steered across available underlay paths according to policies, performance, and reachability. Wireless connections can serve as transport for building overlay links, just as wired Internet, MPLS, or cellular links can. Underlay links are not limited to wired connections, and a VLAN is a Layer 2 segmentation mechanism rather than an SD-WAN overlay link.

Ghayth 2026-09-19 11:51:29

Selected Answers: A, E

Fortilinks is like LAN interface, not WAN so that it can't be underlay

Anonymous User 2026-10-07 21:28:25

Selected Answers: A, E

ans A and E