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Also known as the forwarding plane, it handles the actual processing of packets based on the control plane's decisions. In SDN, data plane devices (like switches and routers) forward traffic based on flow tables received from the control plane.

The centralized unit within a software-defined network that maintains a comprehensive view of the network and manages the control plane's functionality to route traffic efficiently.

A virtual network that is built on top of another network. In SDN, overlay networks allow for the creation of virtualized network layers that can be managed independently from the physical infrastructure.

Network traffic that flows into and out of a data center, typically involving client-to-server or Internet traffic, as opposed to East-West traffic which is lateral movement within the data center.

The component of a network that is responsible for making decisions about where traffic is sent. In SDN, the control plane is abstracted from the physical devices and may reside on a separate controller.

An interface between the SDN Controller and the switches/routers 'below'. It facilitates communication to the network hardware to implement the decisions made by the control plane.

The physical infrastructure underlying the SDN overlay networks. It consists of the network hardware such as switches and routers that provide the physical connectivity and transport services.

A network architecture concept that uses virtualization technology to manage network services and functions. NFV decouples network functions from hardware appliances to increase flexibility and scalability.

The concept of creating multiple virtual networks on top of a shared physical infrastructure. Network slicing allows for resource allocation and isolation for different types of services or tenants.

A protocol that enables the SDN Controller to directly interact with the forwarding plane of network devices such as switches and routers, both physically and virtually.

Network traffic that travels within a data center, often between servers, storage, and applications, as opposed to North-South traffic which moves in and out of the data center.

An interface between the SDN Controller and the applications and business logic 'above'. This API enables the network to be programmable and allows for the creation of networking applications.

Application Programming Interface; a set of tools and protocols that allows different software entities to communicate. In the context of SDN, APIs like OpenFlow enable communication between the control and data planes.

The process of combining hardware and software network resources into a single, software-based administrative entity, a virtual network. This concept is a key component in SDN, enabling flexible network management.