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2.3 Delegation
Remember
that one of the main goals of the design of the Domain Name System
was to decentralize administration? This is achieved through
delegation. Delegating domains works a lot like
delegating tasks at work. A manager may break up a large project into
smaller tasks and delegate responsibility for each of these tasks to
different employees.Likewise,
an organization administering a domain can divide it into subdomains.
Each of those subdomains can be delegated to other organizations.
This means that an organization becomes responsible for maintaining
all the data in that subdomain. It can freely change the data and
even divide its subdomain into more subdomains and delegate those.
The parent domain retains only pointers to sources of the
subdomain's data, so that it can refer queriers
there. The domain stanford.edu, for example, is
delegated to the folks at Stanford who run the
university's networks (see Figure 2-7).
Figure 2-7. stanford.edu is delegated to Stanford University
Not all organizations delegate away their whole domain, just as not
all managers delegate all their work. A domain may have several
delegated subdomains and also contain hosts that
don't belong in the subdomains. For example, the
Acme Corporation (it supplies a certain coyote with most of his
gadgets), which has a division in Rockaway and its headquarters in
Kalamazoo, might have a rockaway.acme.com
subdomain and a kalamazoo.acme.com subdomain.
However, the few hosts in the Acme sales offices scattered throughout
the U.S. would fit better under acme.com than
under either subdomain.We'll explain how to create and delegate subdomains
later. For now, it's important only that you
understand that the term delegation refers to assigning
responsibility for a subdomain to another organization.
