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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. With this being said, we can say that SDN controller offers administrators the bird's eye view of the whole network it and functions as a virtual brain. They can't just monitor the traffic but can even dictate the underlying systems similar to routers as well as other network gear, switches, how the network traffic must be handled and so forth. As a result, network engineers can respond easily to individual changing needs and to shape traffic flow without manipulating and hunting for individual switches. As a matter of fact, SDN is the central brain and functions as intermediary between two levels. Applicator layer is the level above the controller and all data that's travelling to that level is northbound while infrastructure is the level below it which all data travelling in this direction is southbound.
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API or Application Programming Interface means the set of tools and protocols used in building software applications. In expressing software about various components similar to output and inputs as well as operations, APIs are what used. Knowing about this in SDN, the southbound APIs are communicating with routers and eth switches below while northbound APIs communicate with all apps on top.
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The primary benefit of incorporating SDN is that, the operational expense and capital is significantly reduced. Automation and functional separation, optimization strategies, significant cost savings can be achieved as well. 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. The reason behind this is that, 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.

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