The Internet & World Wide Web

1. The Internet & World Wide Web

2. The Internet World Wide Web – Multimedia portion of 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.

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 – email 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 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 email, web hosting

6. How the Internet Works Protocols for the 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 • Domain name – text based name for an IP address IP address – numeric address identifying a computer / device on the Internet (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 (email) • 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. E-mail E-mail address - Unique name that consists of a user name and domain name that identifies the user jane_doe@students.towson.edu.us 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.