1. What is a Data center? How many DCs could typically be there within a single AZ? Are there any limitations to that? 2. How close is one AZ to other AZ within a region? What are the different factors considered while choosing the distance between each AZ within a region? 3. In how many locations in Africa, do AWS have regions? 4. Do you know why AWS regions mostly have 3 AZs within a region as a standard? What could be the strategy behind that? 5. What are Domain controllers in AZs? What do they do?