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Software Defined Networking SDN or Software Defined Networking is actually a revolutionary concept that seeks to optimize the network’s function and improve its efficiency further. 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. In relation to this, SDN controller serves as a virtual brain of a network and offering administrators the bird’s eye view of the entire network it covers. 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. Basically, SDN controller 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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Application Programming Interface or simply API indicates 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. 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 operational expense and capital is significantly reduced is the primary benefit of integrating SDN. As a matter of fact, you can also attain 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 associated time and expense and even manual administration with reconfiguration are reduced dramatically. At some point in time in which loopholes still exist in networking technology like complexity, inability to scale down or up quickly and vendor dependence are the leading cause to the 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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