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→How DNS resolution works
We'll go over this in class, but you should also read in your own time the [https://en.wikipedia.org/wiki/Domain_Name_System#Address_resolution_mechanism Address resolution mechanism] section (including the Recursive and caching name server subsection) on Wikipedia for an overview of a DNS query. The diagram there is also quite simple and appropriate. DNS is a large topic but this is the minimum that you need to understand for this course.
We will not be setting up our server to do [https://en.wikipedia.org/wiki/Reverse_DNS_lookup Reverse DNS Lookups] but you are expected to understand the difference, in particular you should understand that:
* Your registrar (whomever you pay for your domain, even if you run your own DNS server) is responsible for normal (forward) DNS resolution of your domain.
* Your ISP (whomever you pay for your internet connection, i.e. the company that assigned a public IP to your server) is responsible for revers DNS lookups for your IP.
= INVESTIGATION 1: CONFIGURING DNS SERVER =
