We all know the DNS, right? But when we need to troubleshoot it, it’s getting much more complicated than initially thought. DNS ≠ DNS ≠ DNS. And unfortunately: It’s Always DNS.
To get a better understanding of those different kinds of DNS servers (authoritative vs. recursive), DNS messages (recursive, iterative, zone transfer, …) as well as other techniques (conditional forwarding, DoH, …), I draw a poster to have it all at a glance! Here it is: