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How Does the Internet Work? A Basic Introduction to the Worlds Biggest Computer Network.

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Presentation on theme: "How Does the Internet Work? A Basic Introduction to the Worlds Biggest Computer Network."— Presentation transcript:

1 How Does the Internet Work? A Basic Introduction to the Worlds Biggest Computer Network

2 Aims of this Session What is the Internet? How does the Internet work? How do I connect to the Internet? What happens when I connect? What do I need to do to safeguard myself and my computer? Where can I get more help?

3 How did it all Start? Grew out of an experiment begun in the 1960's by the U.S. Department of Defence The Web physically consists of your personal computer, web browser software, a connection to an Internet service provider, computers called servers that host digital data and routers to direct the flow of information.

4 Some Internet Facts In North America and Europe 1 in 6 people use the Internet About 20 million households shop online Over 100 million domains registered to date and rising Its still only 1% of the worlds total population that own a computer!

5 How does it all work? Telephone number 0845 123456 Username and Password Your Computer Your Internet Service Provider (ISP)

6 How does it all work? Computers An Internet Service Provider (ISP) Computers

7 Part of the World Wide Web Your Computer The World Wide Web

8 Connecting Computers Each computer on the Net is connected via a network of cables Your computer connects to that network using an ISP When you connect you are given an IP address (

9 Hyper Text (HTML) The glue that holds the Web together is called hypertext and hyperlinks. This feature allows electronic files on the Web to be linked so that you can easily jump between them

10 Domain Names Domain Names are the familiar, easy to remember names for computers on the Internet (such as correspond to a series of numbers (called Internet Protocol numbers or IP addresses)

11 Computer Names & IP Addresses Computer names (domain names) are resolved to IP addresses A huge database (the biggest in the world!) matches names to numbers Demonstration of Superscan & Neotrace (see )

12 Demonstration of Superscan & Neotrace (Visual Trace)

13 What is a Domain Name? http:// short for Hypertext Transfer Protocol www. is a page on the World Wide Web is the domain name christmas is the directory or folder index.html is the name of the web page

14 Finding a Web Page?

15 What can you Access? Pages of information Music Pictures Video Files Programs In fact anything that can be stored on a computer!

16 Caution Because you are connected to a world wide network and you can access many resources - it make sense that others may also be able to access your information! Consider protection against misuse Consider creating policies

17 The Firewall A firewall ISOLATES your computer from the Internet using a "wall of code" that inspects each individual "packet" of data as it arrives at either side of the firewall - inbound to or outbound from your computer - to determine whether it should be allowed to pass or be blocked.

18 What is a Firewall? A firewall ISOLATES your computer from the Internet It can be software or hardware

19 You need a Firewall if: Your computer's files need to be accessed remotely across the Internet. You are operating any sort of Internet server such as Personal Web Server. You use any sort of Internet-based remote control or remote access program You want to properly and safely monitor your Internet connection for intrusion attempts.

20 What is a Virus Scanner? A virus scanner protects your computer from malicious files It is software that checks each file for any hidden dangers!

21 Virus Protection Install a good programme Update it regularly Always Scan attachments to emails Dont introduce any file to your system without checking it first Keep backups of critical files

22 Policies and Procedures Strategic planning of Information Technology (IT) must be aligned with the strategic corporate planning of the organisation Health & Safety, Data Protection, Security, Support, Training, Purchasing, Backup, Internet & Email use etc. etc.

23 Further Training Available Visit: Tel: 0161 247 6172 Advanced Internet, HTML Training and Real-time Communications Free, self paced and on-line You will need to register with MIID first

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