Review and Discussion Questions 1-Describe three common network topologies and four network types in common use today. 3-What is software-defined networking (SDN), and what advantages does it offer? 5-Describe how the Web works by identifying and explaining the role of its key components. 7-What is the purpose of client-side computing? What is the purpose of server-side programming? 9-Describe five common Internet and Web applications. 11-Develop a spreadsheet to track the amount of time you spend each day on Twitter, Instagram, Facebook, and other social networks. Record your times on each network for a two- week period. What percent of this time would you consider informative and worthwhile? How much time is just socializing or entertainment