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The Internet connects millions of computers across the world, it is a collection of thousands of networks that all work together to share information. The Internet was originally developed in the 1970s by the US Department of Defense. It began as a research project to connect a number of different networks. The purpose of the internet was to link supercomputer centers, in order to support millitary research and computer science projects. The network was also used for electronic mail, file transfer,and newsgroups. The Internet backbone is a collection of the largest networks on the Internet. It provides a high-speed communication path, and carries the largest volumes of traffic on the Internet. Since the original backone was established, more than 25,000 networks around the world have connected to the Internet. Private organizations can use Internet technologies to create a network called an Intranet. While the Internet is a worldwide network, an Intranet is an internal network. It is a secure network in an organization that can be accessed only by people with authorization, such as employees. An extranet is similiar to an Intranet, except that it can be accessed by people outside the organization. It provides different levels of access to users with valid usernames and passwords. Using an extranet is becoming a very popular way for business partners to exchange information. Networks use protocols (standards) to define how computers communicate with each other. The protocol suite used on the Internet is called the Transport Control Protocol/Internet Protocol (TCP/IP). TCP/IP enables data to be transmitted between different types of networks connected to the Internet. TCP/IP divides messages into network packets to be transmitted over the Internet. A network packet consists of the IP header field and the TCP header field, each followed by the data field. Each packet is transmitted individually and can follow different routes to its destination. Internet Explorer-- When you install Windows 95 or Windows NT on your computer, Microsoft Internet Explorer 4.0 is installed automatically. But before you can use your browser, you need to check the TCP/IP configuration and ensure that the network settings are correct. Let's take a look at how you would configure Internet Explorer.

1. You double-click the Internet Explorer icon on your desktop.
2. Then you select Internet Options from the View menu.
3. The Internet Options dialog box is displayed.
4. First you need to set up a connection to the Internet.
5. So you select the Connection tab.
6. In this case you want to use the connection wizard, so you click the Connect button.
7. The Internet Connection Wizard screen is displayed.
8. Then you click Next.
9. The connection wizard offers you three different ways to connect to the Internet.
10. Lets say you want to connect to the Internet through your LAN.
11. So you select the second option, U want to set up a new connection ...(LAN).
12. Then click the Next button.
13. Now you select the Connect using ...(LAN) radio button.
14. And then you select Next.
15. You are asked whether your network is connected through a proxy server. A proxy server can act as a gateway between your local network amd the Internet. You don't need to have a proxy server unless your administrator has one installed and requires that you use it. However, it can improve the security to your network, filtering requests to and from the Internet.
16. In this case you select the No radio button and click Next.
17. To set up and Internet mail account, You select Yes here.
18. Then you click Next.
19. Now the wizard prompts you for information about your Internet mail account.
20. In this example you choose to select an existing mail account, so you select the appropriate option.
21. Then you click Next.
22. Now you see a list of your Internet mail account settings.
23. These include the Internet mail, account name, your e-mail address and display name, your incoming and outgoing e-mail server addresses, your e-mail account logon information.
24. You can use this screen to confirm your settings or to chang them.
25. In this case you want to use the Internet mail account you selected without changing any of its settings.
26. So you select No and click Next.
27. Now the wizard offers you the option to set up an internet news account, which would enable you to join discussion groups over the Internet.
28. In this case you select No.
29. And then you click Next.
30. The next option is to set up an Internet directory service. This provides access to an address book with information on other people using the Internet.
31. You can't select Yes here unless your ISP offers a directory service. Let's assume your ISP does provide the service, amd you want to set up a directory service, so you click Yes.
32. Then you select Next.
33. You can either set up a new directory or modify an existing service.
34. To set up a new directory, the wizard asks you for the following details, you Internet directory (LDAP), server name, your internet directory, server log on information, if required, whether you want to check e-mail addresses using this directory service, a friendly name for this Internet directory service.
35. In this case, you want to modify and existing directory called Bigfoot.
36. So you select the Modify.. service radio button and ensure Bigfoot is highlighted.
37. And then you click the Next button.
38. The wizard prompts you to confirm the settings for your Internet directory service.
39. The settings are correct, so you click No.
40. Then you click the Next button.
41. You should have completed the configuring of your Internet connection, so you click Finish. When you have established an Internet connection, you can customize Internet.