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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. In SDN, there is basically a central control layer that is meant 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 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. As a result, network engineers can respond easily to individual changing needs and 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. The applicator layer is the level above controller and all data that travels 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 are used to help express software when it comes to various components similar to output and inputs as well as operations. Thus, the northbound APIs in SDN communicate with all the apps on top while the 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. 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. This is because of the reason that traffic loads can be 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 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.