I graciously acknowledge and appreciate the collaboration with the teams at Cisco Systems and the Australian Communications Consumer Action Network (AC-CAN). Their involvement and the input provided at various stages of this work were inevitably productive. v I have been extremely fortunate to meet and interact with several talented, interesting, and fun fellow research colleagues, Mohammad Hossein, Ayyoob, Sharat, Iresha, Jawad, Minzhao, and Thanchanok (Tara), who spared their time to help me with both the happy and boring parts of the Ph.D. I cannot forget friends who went through hard times together, cheered me on, and celebrated each accomplishment. Anu Raghavi, Arunkumar, Gajan, Kaavya, Kawsihen, Navaroshan, Sirojan, and Tharshini -thank you for keeping my life nourished and fun-filled.Words cannot express my gratitude to my parents and family, Sivanathan, Sasikala, Abhayan, Aparajithan, and Dhanya for constantly encouraging me to pursue a doctoral degree. My deepest appreciation is dedicated to my wife, Anusuya. You have been extremely caring and supportive of me throughout this entire process and have made countless sacrifices to help me get to this point whilst carrying your own burdens. Also, I would like to thank Anusuya's parents and family members for their constant moral support during this journey. Aekan and Pavinesh, because of you, I laughed harder and smiled more.Finally, I'm grateful to the people of Australia, who as a country has generously offered me all the necessary rights, respect, peace and safe environment, some of which were even refused in my country of origin. vi