The SDN paradigm is still in an early stage of development. Considering full automatization and effortless management as the main objective of these networks, we believe diverse challenges need to be tackled. For this purpose, this article reviews the SDN architecture from top to bottom, paying attention to components yet under standardization or that demand enhancement from a network operator's perspective. The main conclusion is that the SDN area requires a significant amount of research to reach its full potential, which we consider a huge opportunity to innovate toward a truly human-defined networking.

中文翻译：

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从软件定义网络到人工定义网络：挑战与机遇

SDN范例仍处于开发的早期阶段。考虑到完全自动化和轻松管理是这些网络的主要目标，我们认为需要应对各种挑战。为此，本文从上至下回顾了SDN架构，并关注尚未标准化的组件或从网络运营商的角度出发要求增强的组件。主要结论是，SDN领域需要进行大量研究才能充分发挥其潜力，我们认为这是朝着真正的人类定义的网络进行创新的巨大机会。