c (i.e. data center to data center) as well as north south traffic (data center to client machines). According to Cisco VNI (2016) 63 percent of the total IP traffic will be generated by portable devices such as mobile phones, tablet PC. The Current Network technologies and approaches will not able be to scale up according to the present and future needed of flexible, dynamic scalable and high bandwidth networks. This inflexibility lying in the current technology leads to a new approach i.e. SDN which seems promising to solve the existing and future requirement of the ICT. Some of the points that drive the motivation behind moving towards the SDN networks are: Simplified Switch Design Loose coupling to provide better evolution Ease of network application development Open Network Protocols leads to cost effective devices Better and easy network management Better support to tackle the exponentially growing network and data Better Network Security Solutions Traditional Network In the traditional networking approach, most of the networking functionalities are implemented in a dedicated appliance and hardware i.e. the switches, routers etc. Operating and maintaining today's network is an arduous task because of the many complexities and the various policies implemented on it. To maintain a network from Downloaded: 4/15/2022 9:44:49 AM Nova Southeastern University IP Address: 137.52.76.29 Introduction to SDN and NFV global perspective, it is required to express global network policies but to configure this network operators have to configure each individual network devices separately. Today's network is a heterogeneous collection of switches, routers and middle boxes, which uses vendor specific and low-level commands, which is a very complicated, expensive and error-prone process. So implementing new global policy or changing a small set of device need each device to configure separately using the command line interface provided by the vendor. This modification or scaling of networks is a complex and time taking task. 