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Software Defined Networking

SDN or Software Defined Networking is a revolutionary concept that is seeking to optimize the function of a network and improve its efficiency drastically. There’s a central control layer in every SDN that is designed to regulate the flow of info as well as the associated usage of bandwidth and several other parameters. For this, SDN controller serve as a virtual brain of a network and offering administrators the bird’s eye view of the entire network it covers.

They couldn’t just monitor traffic but can also dictate the underlying systems like routers as well as other network gear, switches, how the network traffic must be handled and so forth. For this reason, network engineers can easily respond to the changing business needs and be able to shape traffic flow without manipulating and hunting for individual switches.

Basically, SDN controller is the central brain and functions as intermediary between two levels. The infrastructure is the level below which all data travelling in this direction is southbound while the applicator layer is the level above the controller and all data travelling to this level is northbound.
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API or Application Programming Interface means the set of tools and protocols used in building software applications. APIs are used to help express software when it comes to various components similar to output and inputs as well as operations. Thus, the northbound APIs in SDN communicate with all the apps on top while the southbound APIs are communicating with routers and eth switches below.
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The operational expense and capital is significantly reduced is the primary benefit of integrating SDN. Other benefits include automation and functional separation, optimization strategies, significant cost savings. Moreover, higher reliability in the network function is acquired and even programmable switches and interfaces meaning, scaling down or up of network operation is simple. This is due to the reason that the traffic loads are quickly adjusted, cost effective and dynamic. Because of that, SDN seeks to be a real bridge between physical hardware part and intelligence part without any compromises on efficiency or functionality. The time and the expense as well as manual administration associated with reconfiguration are reduced dramatically.

At some point in time when loopholes exists in networking technology such as complexity, inability to scale down or up quickly and vendor dependence are leading cause to slow growth, software defined network appears to be the hope of all this. With the dawn of a new era that’s data driven, app intensive at every touch point and cloud centric, SDN is set to be the answer to having continuous progress.