Novell NETWARE 6-DOCUMENTATION Manual page 1609

Figure 5 Traditional DNS Structure
Secondary
DNS Server 1
(novell.com)
Replica: novell.com
Resource Records Replica: novell.com
SOA
Resource Records Zone:
A
NS
SOA
MX Resource Records
A
CNAME
NS
SOA
A
MX
A
A
CNAME
NS
A
A
MX
A
A
CNAME
.
.
A
A
.
A
A
.
.
A
.
A
.
.
.
Master
DNS Server
novell.com
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.
Secondary
DNS Server 2
(other.com)
Replica: other.com
Replica: Resource Records other.com
SOA
Zone: Resource Records other.com
A
NS
SOA
Resource Records MX
A
CNAME
NS
SOA
A
MX
A
A
CNAME
NS
A
A
MX
A
A
CNAME
.
.
A
A
.
A
A
.
.
A
.
A
.
.
.
35
Understanding