e much faster than a high level programming language because there is no overhead of converting into low level or say bytecode (in case of Java) Today's scenario should atleast pose a challenge in front of these controllers to not become a blockage in the way of OpenFlow switches which are responsible for adding or deleting flow entries in the flow table. Controller's Vendors As the demand and the need of SDN is increasing day by day, a lot of vendors are on the verge of entering the market or have entered. Vendors are those exact people which can be pictured in the mind right now. The only minuscule of difference is that these vendors are much more sophisticated in the product they sell and are highly efficient in their production process of controllers. Now as there are many similar products in the market, similarly this field has equal number of competitions too. This is creating volatility in the market and creating a pandemonium in the controller market too. The major owners to these products are not general public but multi- million dollar organizations or big tech giants who have a lot of funds to invest. But when it comes to bargaining, no one has the guts to settle for a saddle point. Everyone wants to earn themselves high profit or prevent themselves for huge loss. Thus, Organizations evaluating controllers should not only focus on the technical attributes of the controllers but also on the vendors as to what are their credibility percentage, where do they stand in market, what are their past sales ratio, number of defects produced per set of products etc. Downloaded 4/15/2022 9:44:49 AM Nova Southeastern University IP Address: 137.52.76.29 The Heart and Brain of SDN The above factors are a look upon but a major factor that cannot be missed by any IT organization is to see that "Whether the vendor has technical and financial capability to handle ongoing research and development in the field of SDN?" Agility plays a key role in defining how strong and for how long is the vendor going to stay in market. T