Part B: Answer the Following Questions1. Draw a diagram for Internet structure from Tier 1to Tier 3. Also explain the role of Tier 1 ISPs in details. (5 Marks)2. Outline the steps taken by Network designer to design a Network for any business. (5 Marks)3. How the User Cantered Design (UCD) can decided the success and failure of any Design? Give an example that how a poorly designed interface can lead a product towards failure. (5 Marks)