What term describes network services that provide connectivity between subscriber sites?

• A. SD-WAN Edge
• B. Internet Breakout / Local Internet Breakout
• C. Underlay Connectivity Services
• D. SD-WAN Service Components

Answer: (C)

In SD-WAN, the essential link that actually connects sites is the underlay connectivity. These services constitute the physical and virtual transport network (such as MPLS, broadband, fiber, or cellular) that links subscriber sites together and carries their traffic. The SD-WAN overlay sits above this transport, applying policy and traffic management, but it relies on the underlay to provide the actual connectivity between locations.

Internet breakout describes sending traffic to the public Internet from a site, not the inter-site links themselves. SD-WAN Edge refers to the devices at the sites that join the underlay to the overlay, while SD-WAN Service Components are parts of the overall SD-WAN solution, not the inter-site transport.