Cobalt Digital Inc Cobalt Qube 2 User Manual page 200

Appendix D
To determine which primary name server contains your domain name:
1. The local name server (the DNS resolver/browser machine)
contacts the root domain name server maintained by the several
Internet root server authorities.
2. The root domain name server returns the IP address of the primary
name server responsible for the requested domain name.
3. The local name server contacts the primary name server.
4. The primary name server holds the IP address information for the
domain name in a database and satisfies the request from the local
name server.
5. If the primary name server is unavailable, the local name server
contacts the secondary name server that satisfies the request from
the local name server. The local name server returns to the Web
browser with the IP address for the requested domain name.
6. Using the IP address, the Web browser contacts the company Web
server.
7. The company Web server sends the Web page to the local name
server.
Figure 59 Basic method of DNS
Local
name server
6
7
Target
machine
(www.xyz.com)
186
1
3
4
Primary
name server
2
Root-level
InterNIC
name server
5
Secondary
name server