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What Is Software Defined Networking? Software Defined Networking or simply as SDN is basically a revolutionary concept that seeks in optimizing the function of the network and drastically improve its performance. 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 aren’t just capable of monitoring traffic but is also capable of dictating the underlying systems such as routers as well as other network gear, switches, how the network traffic must be handled and so forth. Because of this, it becomes easier for network engineers to respond to changing business needs and shape traffic flow without having to manipulate and hunt for individual switches. SDN controller is basically 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 refers to the set of tools and protocols that are used in building software applications. APIs help in expressing software in regards to its various components similar to output and inputs as well as operations. For this reason, in SDN, the northbound APIs are communicating with all apps on top while southbound APIs are communicating with routers and eth switches below.
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The primary benefit of incorporating SDN is that, the operational expense and capital is significantly reduced. Other benefits include automation and functional separation, optimization strategies, significant cost savings. Apart from that, higher reliability in networking functioning is obtained and programmable switches and interfaces meaning, scaling down or up of network operation becomes basic. This is because of the reason that traffic loads can be quickly adjusted, cost effective and dynamic. With this in mind, SDN seeks to serve a bridge between physical hardware part and intelligence part without causing any compromises either on its efficiency or functionality. The time and the expense as well as manual administration associated with reconfiguration are reduced dramatically. At some point in time wherein loopholes still exist in networking technology similar to complexity, inability to scale down or up quickly and vendor dependence are known the be the 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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