how to show DNS recursive resolution

If I am asked to explain the concept of DNS recursive resolution, I would prepare a sketch like this one below :



There is an altenative. In a Linux/Unix shell, just issue the command "dig +trace FQDN" can do the same. Dig makes iterative queries to resolve the name being looked up and will follow referrals from the root servers,showing the answer from each server that was used to resolve the lookup.