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The World at Your Fingertip

What is the Internet? A global network of computer networks. Every ... becomes the dominant Web browser. 1995: Microsoft enters market with Internet Explorer ...

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The World at Your Fingertip

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    Slide 1:The World at Your Fingertip - The Internet Shamim Khan

    Columbus State University TSYS Department of Computer Science

    Slide 2:What is the Internet?

    A global network of computer networks Every connected computer can exchange data with any other connected computer Used to communicate, find information, learn, seek jobs, do business Owned by nobody (or everybody)

    1972: ARPANET A few universities and government agencies sharing data 1978: IPSS First international packet switched network Grows from Europe & the US to cover Canada, Hong Kong and Australia by 1981 Late 1980s: The name Internet gains popularity 1990s: Internet spreads worldwide 1992: US Government pulls out Businesses start offering public access How the Internet was born 1989: Created at CERN, Geneva 1992: First text-based Web browser released in 1993: Developed into Mosaic browser at the NCSA 1994: Netscape Navigator becomes the dominant Web browser 1995: Microsoft enters market with Internet Explorer How the Web was spun

    Slide 5:The Internet and Web - What’s the difference?

    The Internet - the infrastructure: the physical connection of millions of networks The Web A collection of interconnected documents, linked by hyperlinks and URLs. Accessible via the Internet

    Slide 6:What is a Web Site?

    A Web site is a collection of related Web documents The index page, or home page, is the top-level page of a Web site. Web pages are individual documents (files) on the web server

    Slide 7:The Hyperlinks Concept

    A reference in a document to another document Selecting a hyperlink causes the computer to load and display the linked document. Hypertext: Text documents with hyperlinks

    Slide 8:Hypermedia

    Hypermedia extends hypertext to multimedia such as music and movies The Web is a distributed hypermedia system

    Slide 9:Web Browsers and Web Servers

    Web browsers display a web document and enable users to follow links to other Web pages. Web servers respond to requests from browsers. find and send requested resources back to the browser.

    Slide 10:Web addresses identify where a Web resource is located. The uniform resource locator (URL): the standard used to identify Web resources. The URL consists of:

    URL Web Addresses (URLs) http:// Protocol identifies the means of access www.yahoo.com/ Server contains the domain name of the Web server help/ shop/ Path identifies the location of the document shop-01.html Resource specifies the filename of the resource

    Slide 11:Internet Protocols

    Transmission control protocol (TCP) –Defines how one computer can communicate with another computer on the Internet Internet protocol (IP) – Defines the Internet’s addressing scheme IP address – Each computer connected to the Internet is given an address composed of numbers and periods. Example: 209.234.156.8

    Domain Name

    Slide 12:Domain Names

    Domain Name System (DNS) – Enables users to type names of Web sites and Web pages as well as IP addresses. Example: www.hsnqp.com or 112.23.345.56 The last part of the domain name gives the type of organization that maintains the site. Examples: .com, .net, .edu, and .gov.

    Slide 13:Internet Services: E-Mail - Staying in Touch

    E-mail (Electronic mail) – the most popular of the Internet services. Messages with file attachments sent and received in seconds.

    Slide 14:Internet Services: IRC - Text Chatting in Real Time

    Internet Relay Chat supports real-time, text-based conversations.

    Your Computer (Client) FTP Server DOWNLOAD UPLOAD

    Slide 15:Internet Services: File Transfer Protocol (FTP)

    FTP is a service that enables client computers to directly copy files to and from a server Uses an FTP server software (eg. WinFTP)

    Slide 16:Internet Services: Telnet

    Telnet— A protocol that lets you directly access certain computer systems on the Internet. Unlike other Net resources that provide access to a computer's files, Telnet lets you use the system's own command-line interface.

    Slide 17:Internet Services: Usenet

    Internet service which enables users to participate in discussions and newsgroups.

    Slide 18:Internet Services: Listservs – Emailing Lists

    A listserv is an automatic list server. Mail sent to everyone on the list when e-mail is generated.

    Slide 19:Internet Services: Telephony (VOIP)

    Internet telephony (Voice Over IP) allows real-time conversations via the Internet instead of a circuit-switched telephone network This can be extended to phone + video for video conferencing

    Slide 20:Finding Information on the Web

    Searching the Web –Involves using search engines to locate Web pages with the information you’re looking for Search engines maintain databases of Web pages

    Slide 21:Using Search Engines

    Choose a search engine (Google, Alta-Vista, Yahoo, etc) Type in one or more words describing your topic The search engine checks its database for Web pages that contain the words typed Links to relevant pages are sent to your computer

    Slide 22:In Summary …

    The Internet and the World Wide Web have a fairly recent history Next to printed text, no other invention has contributed more to the spread of knowledge and understanding The Internet and the Web have much more to offer in services and tools than most of us are aware of

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