The Rise of Software Defined Networks

Software Defined Networking (SDN) is a modern networking architecture that uses software’s to make networks flexible and agile. The control plane controls several devices and has the advantage of enabling businesses and service providers to address the changing requirements actively. It decouples the network control plane from the forwarding plane; this innovation makes it dynamic, cost-effective, and adaptable. Some entities in SDN function in a de-centralized manner like monitoring, fault recovery and security are embedded in network functions.

Structure and working of Software Defined Networks

Software Defined Network has three layers, the application layer, control layer, and infrastructure layer. Two APIs, northbound and southbound link these layers.

The application layer is an innovative alternative to an appliance-based traditional network that uses the controller to accomplish data plane behavior. The control layer serves as a brain of Network defined software. It deals with traffic flow throughout the network and policies for it. The third layer which is called the infrastructure layer constitutes of switches in the system.

The working of Software-defined Networks is based on many technologies, that include network virtualization, automation through programmability, and functional separation.

How is Software Designed Networks taking away the competition?

As it is managed by software’s in control plane, SDN is directly manageable; the networks switch rules can be changed when required.  The administrator has more control and manages traffic load efficiently which is especially useful for cloud computing.  This reduces the costs on switches.

The replacement of hardware by networking software has given the advantage of reduced hardware footprint and less operational cost.

SDNs are more secure as the administrator has more control over the traffic and can drop any suspicious pockets or re-route them. Security policies then can also be organized.

Software-defined networking contributed to the development of software-defined extensive area network (SD-WAN) technology. SD-WAN abstracts an organization’s connectivity links throughout its WAN and creates a virtual system that can use whichever connection the controller deems suitable to send traffic. It applies the virtual overlay property of SDN technology.

SDN has simple operations because many vendors are not involved for specific protocols and devices and SDN controllers provide instructions.

SDN managers can quickly optimize network resources through automated and dynamic SDN programs, which are not subject to proprietary software.

SDNs are application friendly. Applications influence the behavior of networks, which monitor network conditions and according to network configurations adapt to it.

Problems with SDN

After the SDN technology was introduced in 2011, it gained a sudden hype. However, due to the limitation of resources technical and financial its adaptation has been slow especially in small enterprises. Its main adopters are big companies like Google and Facebook network operators, carriers and service providers.

Security is at the same time advantage and a concern with SDN technology. The centralized SDN if accessed by an invader, can bring harm to the network and business related to it. Popular Microsoft courses can be found on Microsoft On Demand whereby they are affordable and you can learn at home.


Hence, Software Defined Networks (SDNs) have vital importance in the field of Information Technology, due to the centralization of the network system and control of network managers over network traffic. However, to increase their applicability, the financial and technical feasibility of the technology should be improved.