A escalabilidade em servidores que adiciona mais nós ao sis...
Pense assim: o servidor em nuvem está rodando uma aplicação, mas está lento porque tá com fome, dê mais memória ram ou processador pra ele, essa ideia é o scale-up ou aumento de melhoria no que já tá. Já o scale-out você aumenta o número de servidores para dividir a aplicação e tornar o processamento mais rápido!
Bons Estudos!
SDN: Software-defined networking (SDN) is an emerging networking paradigm that gives hope to change the limitations of current network infrastructures. First, it breaks the vertical integration by separating the network’s control logic (the control plane) from the underlying routers and switches that forward the traffic (the data plane). Second, with the separation of the control and data planes, network switches become simple forwarding devices and the control logic is implemented in a logically centralized controller (or network operating system), simplifying policy enforcement and network (re)configuration and evolution. It is important to emphasize that a logically centralized programmatic model does not postulate a physically
centralized system. In fact, the need to guarantee adequate levels of performance, scalability, and reliability would preclude such a solution. Instead, production-level SDN network designs resort to physically distributed control planes.
The separation of the control plane and the data plane can be realized by means of a well-defined programming interface between the switches and the SDN controller. The controller exercises direct control over the state in the data plane elements via this well-defined application programming interface (API)
Software-Defined Networking: A Comprehensive Survey