In a software-defined networking architecture, which network component serves as the physical infrastructure that forwards packets?
Overlay network
Underlay network
Control plane
Management layer
The underlay network is the physical infrastructure in an SDN architecture responsible for forwarding packets between network devices. It comprises the actual routers, switches, and links that form the foundation of the network. While the overlay network provides virtualized network services on top of the underlay, and the control plane manages routing decisions, it is the underlay network that physically moves the data.
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