Explaining the DNS Hierarchy
DNS uses a hierarchical approach to name resolution in which resolution is passed up and down a hierarchy of domain names until a particular computer is located. Each level of the hierarchy is divided by dots (.), which symbolize the division. A fully qualified domain name (FQDN), such as server1.sales.companyabc.com, uniquely identifies a resource’s space in the DNS hierarchy. Figure 10.1 shows how the fictional CompanyABC fits into the DNS hierarchy.
![Image](/api/v2/epubs/9780133116007/files/graphics/10fig01.jpg)
Figure 10.1. DNS hierarchy.
The top of the hierarchy is known as the root, and is represented by a single . (dot). Moving down the DNS hierarchy, the next layer in ...
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