Apple Training Series Mac OS X Server Essentials, Second Edition

7. The DNS service handling all of apple.com’s servers returns the information concerning

how to contact train.apple.com, and the Japanese DNS server hands over that informa-

tion—in the form of an IP address—to the client that originally made the request.

All valid DNS servers on the Internet can eventually find DNS information on any address

by following the hierarchical lookup through this top-level approach. In this case, the

computer in Japan finds the correct DNS mapping by following the lookup process and

eventually finding a DNS server in the United States that is responsible for mapping the

address train.apple.com to the IP address 17.254.2.78.

This process highlights the other key aspect of DNS—locally maintained DNS servers. For

example, ...