1 Introduction  
2 SDN as an Advancement over Conventional Network  
3 Motivation  
4 Literature Survey on Historical Evolution of SDN  
5 Literature Survey on SDN Technology and Architecture  
5.1 Infrastructure Layer  
5.2 Controller Layer  
5.3 Control Layer Performance  
5.4 Controller Interface  
5.5 Application Layer  
6 OpenFlow  
7 Working of SDN  
8 Architecture Survey  
9 Software Defined Heterogeneous Network (SDHN) Architecture  
10 Current Research and Standardization of SDN as NGN  
10.1 Ongoing Research Efforts  
10.2 Standardization Efforts  
11 Conclusion