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Chapter 9. DNS and sendmail > Overview
9.1. Overview
DNS stands for Domain Name System. A domain is any logical collection of related hostnames or site names. A naming system is best visualized as an inverted tree of information that corresponds to fully qualified domain names (see Figure 9-1) organized in a name space (as opposed to physical space). Local or regional knowledge about an individual part of that name space is call a DNS zone. We will expand on these concepts soon.
Figure 9-1. Domain names form a tree of information
