(Solved): A. Briefly discuss what is the Doman Name System (DNS) and what is its purpose. B. Using the figure ...

A. Briefly discuss what is the Doman Name System (DNS) and what is its purpose. B. Using the figure below, differentiate between the Interactive DNS query and the Recursive DNS query by giving a step-by-step walkthrough of the process, assuming that a host is trying to visit gaia.cs.umass.edu, but the browser doesn't know the IP address of the website. C. Which type of query is considered best practice: iterative or recursive? Justify your answer.