Red Hat® Linux® 7 Unleashed

Delegating Authority

With millions of domain names and URLs on the Internet, the only way to keep track is with a distributed system. DNS implements this distribution through delegation to subdomains.

This section implements a trivial delegation whose purpose is illustrative only. No MX, no CNAME, no secondary server, not even reverse DNS. Just the same subnet as the rest of the examples in this chapter.

Imagine that a new department, called Subdomain, wants to administer its own DNS. That makes less work for the domain.cxm administrators. Table 14.2 shows that the department has four hosts.

Table 14.2. The Subdomain Department's Servers

Host	IP
sylvia	192.168.100.40
brett	192.168.100.41
rena	192.168.100.42
valerie	192.168.100.43

So from a DNS ...