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Unit 6: Domain Name System
Mithilesh Kumar Dubey, Lovely Professional University

unit 6: Domain name system notes

contents
Objectives
Introduction
6.1 Domain Name System (DNS)

6.1.1 Configuring DNS Server
6.1.2 DNS Server
6.1.3 Dynamic DNS
6.1.4 Other DNS Server Files
6.1.5 DNS Tools, Testing, and Troubleshooting

6.1.6 A Simple DNS Server
6.1.7 DNS Server Functions
6.2 Summary
6.3 Keywords

6.4 Self Assessment
6.5 Review Questions
6.6 Further Readings

objectives

After studying this unit, you will be able to:

l z Define domain name system
introduction

DNS acts as a directory service for all of these systems and let you to specify each one by its
hostname. A telephone book allows you to look up an individual person by name and get their
telephone number, their unique identifier on the telephone system’s network. DNS allows you to
look up individual server by name and get its IP address, its unique identifer on the Internet.

6.1 Domain name system (Dns)

There are other hostname-to-IP directory services in use, mostly for LANs. Windows LANs can
use WINS. UNIX LANs can use NIS. But because DNS is the directory service for the Internet
(and can also be used for LANs) it is the most widely used. UNIX LANs could always use DNS
instead of NIS, and starting with Windows 2000 Server, Windows LANs could use DNS instead
of, or in addition to, WINS. And on small LANs where there are only a few machines you could
just use HOSTS files on each system instead of setting up a server running DNS, NIS, or WINS.

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