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Slide 21 of 76
Notes:
All name resolution begins with the root nameservers
Root nameservers provide the answers to the top-level domains
Root nameservers are critical to the name resolution
if all nameservers were unavailable for an extended period of time, all name resolution on the Internet would fail
to protect against this, the Internet has multiple nameservers spread across different parts of the network
Nameserver queries come in two flavors:
recursive: places the bulk of the query process on a single nameserver to continue quering until it learns the answer
non-recursive (or iterative): the nameserver gives back the best answer that it already knows. This is less work
Root-nameservers are non-recursive and return answers pointing to the next domain level
