a) How does a caching resolver (your computer) knows where to send "recursive" DNS queries (= IP of the caching resolver)? b) How does a stub resolver knows where to send queries when its cache is completely empty? (= IP of a root zone server)? c) Using dig command or web interface, obtain A record for "www.microsoft.com" from two different regions (one from USA and one outside USA). In command line, you need to use @ipof-caching-resolver and in web interface, you need to select a different caching resolver d) Results of DNS queries are designed to be cached for a period of time by the resolvers. Where this time comes from? Show example (e.g., using the previous part)