Zones and Delegation
Although DNS appears to be working with domains and subdomains, the boundary of the authority of domains is not drawn between a domain and a subdomain. It is drawn between zones, with which DNS works. The line between what is a zone and what is a domain is a bit arbitrary. One thing is sure, though: If a division of authority exists then separate zones exist. When a domain is delegated to you, you set up a zone file for the domain. If the zone has subdomains that other people maintain, you delegate those domains to them, and they will set up zones for them. If the zone has subdomains that you maintain then the zone can contain both the domain and the subdomains.
A good example of this is the university I attended, the University ...
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