User Guide

Understanding 35
Novell DNS/DHCP Management Utility Administration Guide
103-000164-001
September 4, 2001
Novell Confidential
Manual 99a38 July 17, 2001
Figure 5 Traditional DNS Structure
The file storing the RRs for a zone might have hundreds or thousands of
entries for different types of resources, such as users' addresses, hosts, name
servers, mail servers, and pointers to other resources.
When a client initiates a request to resolve a domain name to an IP address
(perhaps by using an Internet browser or by sending e-mail), the client sends
a query to the name server specified in the client's configuration. The name
server that receives the query searches its authoritative zone information for
the desired record. If the record cannot be found, the name server will forward
the query up the hierarchy to the name server above it for resolution.
When updates are made to the master name server, the entire contents of the
database file must be copied to any secondary name servers.
SOA
A
NS
MX
CNAME
A
A
A
A
.
.
.
Resource Records
Replica: other.com
SOA
A
NS
MX
CNAME
A
A
A
A
.
.
.
Resource Records
Replica: other.com
SOA
A
NS
MX
CNAME
A
A
A
A
.
.
.
Resource Records
Replica: novell.com
SOA
A
NS
MX
CNAME
A
A
A
A
.
.
.
Resource Records
Replica: novell.com
SOA
A
NS
MX
CNAME
A
A
A
A
.
.
.
Resource Records
Zone: novell.com
Master
DNS Server
Secondary
DNS Server 1
(novell.com)
SOA
A
NS
MX
CNAME
A
A
A
A
.
.
.
Resource Records
Zone: other.com
Secondary
DNS Server 2
(other.com)