on details of the controllers such as federation of multiple controllers, the hierarchical connection of controllers, communication interfaces between controllers, nor virtualisation or slicing network resources but it still gives a general idea as to where the controller stands in an SDN environment. The upcoming days or TTL (time to live) in nerds language, for SDN completely depends on the level of understanding network managers and programmers and administrators are able to build. If given a chance in the industry like Google did, and succeeded with SDN, this technology can go berserk and take on the entire Tech industry. It is just a matter of time when people try to understand its utmost importance and give its privileges it deserves. Not to worry if certain sections remained unclear while reading through, it might take some time to sink in. Going through the unit again would clear your views. Whenever you feel to drop out, remember this quote by Bruce lee, Downloaded 4/15/2022 9:44:49 AM Nova Southeastern University IP Address: 137.52.76.29 The Heart and Brain of SDN I am not scared of a man, who has practiced 10,000 kicks a single time, I am afraid of that man who has practiced a single kick 10,000 times. The more you read, the better you grow. REFERENCES A & M. (2012, April). Ten Things to look for in an SDN Controller. Retrieved April, 2017, from http://www.webtorials.com/content/2012/08/2012-application- service-delivery-han Controller Benchmarker. (2008). Retrieved from https://www.openflow.org/wk/ index.php/Oflops Franciscus, W. X., Gregory, M. A., Khandakar, A., & Gomez, K. M. (2017). Multi- domain Software Defined Networking: Research status and challenges. Journal of Network and Computer Applications. doi:10.1016/j.jnca.2017.03.004 H. (2012). Software Defined Networking (SDN): A Revolution in Computer Network. IOSR Journal of Computer Engineering, 15(5), 103-106. Retrieved from http://ict. unimap.edu.my/images/doc/SDN%20IBM%20WhitePaper.pdf Heller, B., Sherwood, R., & McKeown, N. (2012). The contr