In the networking world, the capability to easily monitor, manage, and program many network devices is gaining attention. The paradigm called Software Defined Network (SDN) is the emerging architecture that takes over this challenge. It allows to separate the network intelligence control logic from the physical data-plane appliance, providing a centralized point of control, called SDN controller, that is able to monitor the network behavior and dynamically react to changes with new network configurations. So, the underlying hardware technologies are still there, but they are programmed by means of third-party software applications. In fact, the power of the SDN technology relies on internal services that expose APIs to applications to help them manage endpoints and the entire infrastructure with higher speed and flexibility.