How does MEF SD-WAN support multi-vendor environments?

• A. By using open APIs, standardized interfaces, and an abstraction layer that allows different vendors’ edge devices and controllers to interoperate.
• B. By requiring all vendors to implement MEF-approved hardware only.
• C. By isolating each vendor's domain with no cross-communication.
• D. By using a single vendor's controller for all devices.

Answer: (A)

Interoperability across vendors is achieved by decoupling management from vendor-specific devices through open APIs, standardized interfaces, and an abstraction layer that presents a uniform control model to the orchestrator. In MEF SD-WAN, edge devices from different vendors expose common southbound interfaces and data models, and the orchestrator uses these open APIs to provision and manage services without caring about underlying vendor details. This enables a single control plane to coordinate devices from multiple vendors and deliver consistent services across the whole network. The other approaches would either lock you into one vendor or isolate domains, which would prevent true multi-vendor operation.