1. The Internet & World Wide Web

2. The Internet
Network - Collection of computing devices connected together to share resources Internet – Global network of networks enabling people to communicate, collaborate and share information and resources.
World Wide Web – Multimedia portion of the Internet.

3. History of the Internet
Late 1960’s – DOD’s ARPANET (Advanced Research Project Agency Network )
1980’s – NSF’s CSnet (connecting all US universities)
Domain Name System established
Early 1990’s - World Wide Web
Graphical browser
By 2000 – Extensive global use
p. 69

4. Applications of the Internet
Communication – and chatting / messaging Browsing / research – accessing the Web E-commerce – buying, selling and trading online Other – telephony, newsgroups, ftp, etc.

5. How the Internet Works Internet backbone (physical infrastructure)
Protocols (standard language)
Ensure that devices communicate in a uniform and manageable manner
Internet backbone (physical infrastructure)
Consists of national and international communication networks
Internet service providers (ISP)
Provide users with physical connection/access to the Internet
Provide other services such as , web hosting

6. How the Internet Works Protocols for the Internet Internet
Transmission Control Protocol (TCP)
Internet Protocol (IP)
Hypertext Transfer Protocol (HTTP)
File Transfer Protocol (FTP)
Internet
A packet switching network
Client/server
Client makes a service request
Server provides the service

7. How the Internet Works
IP address – numeric address identifying a computer / device on the Internet
Domain name – text based name for an IP address
(Shelly, Cashman & Vermaat, 2008)

8. The World Wide Web
World Wide Web – Multimedia portion of the Internet. Comprised of text, graphics audio and video.
A worldwide collection of electronic documents.
Each electronic document is called a Web page.
A Web site is a collection of related Web pages.
Web pages stored on a Web server.
URL (Uniform Resource Locator) - Unique address for a Web page
A web server delivers the Web page to your computer
p. 54

9. The World Wide Web
Web browser - Program that allows you to view and interact with Web page
Internet Explorer
FireFox
Chrome
Safari
p. 54

10. The World Wide Web Hyperlink - Connection to other related Web pages
Elsewhere on same Web page
Different Web page on same Web site
Web page at a differentWeb site
(Shelly, Cashman & Vermaat, 2008)
p. 57

11. The World Wide Web
Plugin -Programs that extend the capability of a browser
You can download many plug-ins at no cost from various Web sites
(Shelly, Cashman & Vermaat, 2008)

12. Communication via the Internet
Communication - number one use / application of Internet
Asynchronous communication ( )
Not real time (not at same time)
Participants can leave messages to be responded to at recipient’s convenience
Synchronous communication (chat)
People communicate in real time
Participants must be engaged in communication at the same time

13.
address - Unique name that consists of a user name and domain name that identifies the user
User name: jane_doe
Sub domain: students
Domain name: towson
Domain root/type: .edu
Country extension (optional): .us
p. 94 Fig. 2-27

14. Intranet, Extranet & VPN
Intranet - internal corporate network built using Internet and World Wide Web standards and technologies
Extranet - network that links selected resources of the intranet of a company with external customers, suppliers, or other business partners.
VPN (Virtual private network) – a secure connection between two points on the Internet

15. References
Shelly, G., Cashman, T. & Vermaat, M. (2008). Discovering computers. Fundamentals, 4th edition. Thomson: Course Technology.