How DNS works
DNS uses a client/server architecture to maintain and distribute
hostnames and IP addresses on networks ranging from small local area
networks to the Internet. This list briefly describes the key concepts
domain name space
All DNS hostnames fit into a name hierarchy, or tree, known
as the domain name space.
This tree radiates from the top, or root, into branches consisting of
nodes (host computers).
An individual branch, or a collection of branches, makes up each DNS
domain: a group of computers at a particular university or company,
or a local network within a particular organization.
A full domain, a domain and its subdomains, or a portion of a domain
for which a name server has the authority to maintain data.
servers and clients
Each zone consists of DNS servers (computers that maintain hostname
and address databases) and DNS clients (networking programs, such
as ping, rlogin, or telnet on
a DNS server or client).
Resolution occurs when a client machine, while attempting
to connect to another machine, queries the DNS server to obtain
the needed IP address.
If a server on the local domain cannot resolve the client request,
it attempts to locate a server that can through the use of iterative
queries to other servers.
DNS domains and zones
Configuring the Domain Name Service
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003