The Internet is made up of client computers, servers, cables and network
connection devices. Each has a different role in the Internet
infrastructures: connection devices are responsible for data traffic
whereas servers enable information and resources to be shared among
the computers. Servers are configured as high performance computers
and running special software to perform their tasks. They operate 24
hours a day for full time service to their clients.
Some of the Servers and Their Tasks
Web Servers
Web Servers are foundation of the Internet. The Web pages are stored
in Web servers. Whenever you open up your browser and type in a Web
site address, it is the server that gets you the page you request.
Mail Servers
Mail Serves are as crucial as Web servers. They move and store mails
over private networks and across the Internet.
FTP (File Transfer Protocol) Servers
FTP servers store text files, graphic files, sound files, etc, and let the
client download and upload them.
Database Servers
Database Servers are specifically configured to run database software.
A database is a collection of data that is organized so that its contents
can easily be accessed, managed, and updated.
Content Management Servers
Content management servers enable the process of creating, editing,
storing, organizing, and publishing content on the Web.
Real-Time Communication Servers
Chat, and IRC servers enable a large number of users to exchange
information in an environment similar to an Internet newsgroup but with
real-time discussion capabilities. Instant messaging servers, like chat
servers, facilitate communication in real time. However, instant
messaging generally involves one conversation between two people.
DNS (Domain Name Server)
DNS matches up the URL of a Web site (eg www.zambak.com) with its
proper numeric IP address. It translates www.zambak.com into the
unique numeric IP address 212.175.211.243. Whenever you request a
Web page the Web browser must consult the domain name server to find
out what the numeric translation of the URL is. This is necessary because
computers only understand the numeric IP address, whereas people
prefer to use meaningful and more memorable text.
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