Separates networking hardware from its control mechanism and uses a centralized interface to deliver virtualized resources to WAN connections.

Separates networking hardware from its control mechanism and uses a centralized interface to deliver virtualized resources to WAN connections.

• A. Software-Defined Wide Area Network (SD-WAN)
• B. Software-Defined Networking (SDN)
• C. VPN
• D. VLAN

Answer: (A)

Separating the control plane from the networking hardware and providing a centralized software interface to manage WAN resources is the essence of SD-WAN. In this approach, the forwarding devices at branch sites still move traffic, but the decisions about routing, link selection, and policy enforcement come from a central controller. That controller abstracts diverse transport links—MPLS, broadband Internet, cellular—into a single virtual WAN, allowing application-aware routing, centralized security, and easier provisioning. This setup enables faster deployment, better use of cheaper internet connections alongside or instead of costly dedicated circuits, and consistent policy enforcement across all sites. While SDN is about decoupling control from data planes across networks in general, SD-WAN applies that idea specifically to wide-area connectivity and the virtualization of WAN resources. VPNs provide secure tunnels, and VLANs segment LAN traffic; neither describes the centralized, software-defined management of WAN resources described here.

Separating the control plane from the networking hardware and providing a centralized software interface to manage WAN resources is the essence of SD-WAN. In this approach, the forwarding devices at branch sites still move traffic, but the decisions about routing, link selection, and policy enforcement come from a central controller. That controller abstracts diverse transport links—MPLS, broadband Internet, cellular—into a single virtual WAN, allowing application-aware routing, centralized security, and easier provisioning. This setup enables faster deployment, better use of cheaper internet connections alongside or instead of costly dedicated circuits, and consistent policy enforcement across all sites.

While SDN is about decoupling control from data planes across networks in general, SD-WAN applies that idea specifically to wide-area connectivity and the virtualization of WAN resources. VPNs provide secure tunnels, and VLANs segment LAN traffic; neither describes the centralized, software-defined management of WAN resources described here.