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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. In SDN, there’s a central control layer seeking 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. 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. 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 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. 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. Aside from that, higher reliability in network functions is necessary and even programmable switches and interfaces meaning, scaling down or up of network operation is pretty basic. 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. SDN is designed to be the answer to continuous progress with the dawn of a new era that is data driven, app intensive at every touch point and cloud centric.