In a software-defined network architecture, what role does the underlay network serve?
It offers application-level services to end-users.
It manages network policies through a centralized controller.
It defines virtual network paths for logical network segmentation.
It provides the physical network infrastructure that transports data packets.
The underlay network provides the physical infrastructure that transports data packets across routers and switches using physical links. It is responsible for forwarding packets based on standard routing protocols. The overlay network, in contrast, creates virtual network paths over the underlay for logical segmentation and advanced networking features. Managing network policies through a centralized controller pertains to the control plane, not the underlay network. Offering application-level services is beyond the scope of the underlay network's responsibilities.
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