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What Is 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. 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. 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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Application Programming Interface or simply API indicates 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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Among the many benefits of implementing SDN is the fact that it significantly reduce operational expense and capital. Automation and functional separation, optimization strategies, significant cost savings can be achieved as well. 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. Thus, SDN is seeking to be a real bridge between the physical hardware part and intelligence part without 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. SDN is set to be the answer to continuous progress with the dawn of new era that’s data driven, app intensive at every touch point and cloud centric.