Subject Index: DNS - Domain Name System Figure 31.1 Values for the most significant segment of a domain name. DNS does not distinguish between names in upper or lower case. Figure 31.2 A graphical representation that illustrates one way a DNS hierarchy might be structured in a corporation. Names for individual computers can be added to the diagram as well. Figure 31.3 Two examples of ways the domain name hierarchy from Figure 31.2 can be divided among three servers. Each organization chooses how to divide names among its servers.