Software Defined Network(SDN) gives flexibilty for more controlling

SDN(Software Defined Network) is an approach to building networks that accomplishes the following: separates the control and data planes, provides a global view of the network to a centralized controller, and enables external applications to program the network. It also promises freedom of connectivity on a number of different levels in the network infrastructure. With this flexibility comes new opportunities for managing and controlling networks.

For example, Employees' insistence on connecting their own devices to the network is one of the more visible examples of this.