Which component serves as the boundary between the subscriber's UNI and the service provider's network in SD-WAN deployments?

• A. SD-WAN Edge
• B. Underlay Connectivity Services
• C. Inter frame gap
• D. 1526 bytes

Answer: (A)

The SD-WAN Edge is the device that marks the boundary between the subscriber’s UNI and the service provider’s network. It sits at the customer edge, terminates the subscriber’s local network, and establishes secure overlays (tunnels) across the provider’s underlay. This edge handles policy, security, and traffic routing for the SD-WAN, effectively acting as the demarcation point where the subscriber’s network hands off to the service provider’s transport.

Underlay connectivity services refer to the actual transport layer provided by the carrier, not the boundary device. Inter frame gap and a specific MTU size are technical Ethernet details, not concepts that define where the subscriber network ends and the provider network begins.