Cobalt Digital Inc Cobalt NASRaQ Manual de usuario descargar pdf (Pagina 180)

Appendix D

166

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 serveral

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 49 Basic method of DNS

Local

name server

Root-level

InterNIC

name server

Primary

name server

Secondary

name server

Target

machine

(www.xyz.com)

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Cobalt Digital Inc Cobalt NASRaQ Manual de usuario Pagina 180