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

Correct Answer: B,D

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