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Software-defined networking (SDN) addresses pressing networking problems such as network virtualization and data center complexity. By separating the control plane from the data plane, SDN introduces a new abstraction layer. This new abstraction layer is typically implemented by means of a so-called SDN controller. SDN applications can interact with the controller to ensure network functionality....
The emerging concept of software‐defined networking (SDN) enables new opportunities for building future networks. In such setups, a so‐called network operating system (NOS), which is also known as SDN controller, provides services to manage the underlying and programmable network infrastructure. On top, the so‐called SDN applications leverage NOS services and implement business needs in order to orchestrate...
Both academic researchers and network vendors have started to promote Software-Defined Networking (SDN) as a new network paradigm, in which controller systems play a major role. A modular and extensible design allows network operators to extend the controller's functionality by so called network services. Unfortunately, in current designs such network services have unlimited access to mandatory SDN...
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