A DNS Query


Given a Domain Name, request information
Information is typed
Can ask for address (A)  Name Server (NS)  Mail Exchange (MX)  and much more.

Assuming no other information, the query
Starts at the root of the tree
Gets referred to next lower subdomain
Until it reaches the domain of the name desired

Each server replies with the names (and usually addresses) of the servers for the next lower sub-domain