DNS Name Space Administrative Hierarchy Partitioning: DNS Zones of Authority
I explained earlier in this chapter that the DNS name space is arranged in a hierarchy and that there is also a hierarchy of authorities that is related to that hierarchical name structure. However, the two hierarchies are not exactly the same. If they were the same, we would need a separate authority for every domain at every level of the tree, and that's something we are very unlikely to want to have everywhere in the structure.
At the very top levels of the DNS tree, it seems reasonable that we might want to designate a separate authority at each level of the structure. Consider the geopolitical name hierarchy; IANA/ICANN manages the root domain, but each of the ccTLDs ...
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