Network Installation

Internet & Intranets

Topics to be discussedInternet.Intranet.E-Mail.

Internet

What is Internet.Birth of the net.How Web works.Making Connections.Web Browsers.Domain names.Search Engines.Understanding Web addresses.

Internet

Global network connecting millions of computers."The" Internet is made up of well over 100,000 interconnected networks in more than 100 countries covering commercial, academic and government endeavors.

Birth of the net.

The Internet began as the ARPANET during the cold war in 1969. It was developed by the US Department of Defense (DOD)

How Web works.

Enter the address of the web site in your web browser.Browser requests the web page from the web server.Sever sends data over the Internet to your computer.Your web browser interprets the data & displays it on your computer screen.

Connecting to the Internet

Dial up Connection – Suitable for small networks & connection is made using a modem .ISDN Connection – used when higher speed is needed & you need a dial-up ISDN account .Dedicated high bandwidth connection –Used when Internet connection needs to be available any time .

Web Browsers.

A software application used to locate and display Web pages. The two most popular browsers are Netscape Navigator and Microsoft Internet Explorer. Both of these are graphical browsers, which means that they can display graphics as well as text.

Domain names.

Domain names are used in URLs to identify particular Web pages. For example, in the URL http://www.hotmail.com, the domain name is hotmail.Because the Internet is based on IP addresses, not domain names, every Web server requires a Domain Name System (DNS) server to translate domain names into IP addresses.

Domain names(contd..)

Every domain name has a suffix that indicates which top-level (TLD) domain it belongs to. There are only a limited number of such domains. For example:

gov - Government agencies edu - Educational institutions org - Organizations (nonprofit) mil - Military com - commercial business net - Network organizations ca - Canada th - Thailand

Because the Internet is based on IP addresses, not domain names, every Web server requires a Domain Name System (DNS) server to translate domain names into IP addresses.

Search Engines

A program that searches documents for specified keywords and returns a list of the documents where the keywords were found.Some of the search engines are AltaVista, Lycos, Yahoo, Excite etc.

Understanding Web addresses

URL - Abbreviation of Uniform Resource Locator, the global address of documents and other resources on the World Wide Web.

Understanding Web addresses

For example, the two URLs below point to two different files at the domain ignou.edu. The first specifies an executable file that should be fetched using the FTP protocol; the second specifies a Web page that should be fetched using the HTTP protocol: ftp://www.ignou.edu/stuff.exe http://www.ignou.edu/index.html

Intranet

Intranet Background.Intranet Details.Intranet Features.Potential Functionality of Intranet.

Intranet

A network based on TCP/IP protocols belonging to an organization, usually a corporation, accessible only by the organization's members, employees, or others with authorization. An intranet's Web sites look and act just like any other Web sites, but the firewall surrounding an intranet protects form unauthorized access.

Technology Components of Intranet

Communication Protocol.File Transfer.Mail.Web Browsing.

Potential Functionality of Intranet

Information sharing/distribution Intra-company communications Decentralized processing for certain functions Hosting Web based applications Intelligent routing with tracking and electronic signatures (workflow automation management)

Difference Between Internet & Intranet

So what is the difference between the Internet and Intranet? Mainly the location of the information and who has access to it.Internet is public, global and wide open to anyone who has an Internet connection. Intranets are restricted to people who are connected to the private company network. Other than that, they work essentially the same way.

Difference Between Internet & Intranet

INTERNET INTRANET

Public Private

World wide Within the Company

Similarity Between Internet & Intranet

Both run on Network.Both use the same type of software (eg.Netscape).Both carry Documents, Data & Multimedia.Intranet = Same technology used in Internet but everything is in-house.

Advantages of the Intranet

Easy to use.Information Sharing.Inter-department communication.Saves Stationary Through rapid online distribution of information.Saves the time spent for hunting up information.Based on open standards Scaleable and flexible Connects across disparate platforms

E-Mail

How it works.Understanding E-mail addresses.Sending an E-mail message.

E-Mail

In its simplest form, e-mail is an electronic message sent from one computer to another. You can send or receive personal and business-related messages with attachments, such as pictures or formatted documents. You can even send computer programs.

How it works

When you send an e-mail messageYour computer sends it to an SMTP server.The server forwards it to the recipients mail server depending on the email address.The received message is stored at the destination mail server until the addressee retrieves it

Understanding E-mail addresses

Typical e-mail addressUser name@domain name.type of domainUser name – refers to recipients mailbox.Domain name – refers to mail server ie. The computer where the recipient has an electronic mail box.Type of domain – whether the host is a government, commercial, educational etc organization.Ex : abc@hotmail.com

Sending an E-mail message

Open your e-mail program and launch a new message window by clicking on the appropriate icon.

Sending an E-mail message

In the TO box, type in the name of the recipient. It should take this form: recipient@domain.com.

You can send a message to more than one person by entering multiple addresses. Just put a semi-colon (;) between each address.

Sending an E-mail message

Type in the subject of the e-mail.

Sending an E-mail message

Write your message in the message window. You can also copy text from a word processing program and paste it into the window.

Sending an E-mail message

Click on the Send icon or select Send from the File menu.

Difference between E-mail & WWW Address