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DNS Zones

Administration in DNS is highly distributed. Responsibility for administrating a Domain within the namespace is assigned on the basis of zones. Actually, the essence of a zone is a file stored on a DNS server, known as a zone file. This file contains information about a portion of the Domain namespace. The server that has the master zone file for a Domain is considered the primary DNS server for that Domain, and any server that has either the master zone file or a copy of it is considered authoritative for that zone. A zone can contain a single Domain and all its sub-Domains, or it can contain one or more sub-Domains. One administrative unit could be responsible for the support.shazbot.com sub-Domain, which might be a zone by itself, whereas another unit could be the primary for the shazbot.com and sales.shazbot.com Domains. Figure 8.3.3 illustrates the relationship between zones and Domains.

Figure 8.3.3. Domains and zones.



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