1 / 14

Internet

Information Resources and Communication , WS 201 3 /201 4. Internet. Ji ří Balej, Martin Podborský, Ludmila Kunderová. 3. 10. 2013. The Internet. 3. 10. 2013. The Internet. „internet“ – is general wide area network formed of many local area networks

quincy
Download Presentation

Internet

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Information Resources and Communication, WS 2013/2014 Internet Jiří Balej, Martin Podborský, Ludmila Kunderová 3. 10. 2013

  2. The Internet 3. 10. 2013

  3. The Internet • „internet“ – is general wide area network formed of many local area networks • „Internet“ („Net“) – international collection of many wide area networks an local area networks. • Internet is the global information system • Internet is „Network of Network“ 3. 10. 2013

  4. Internet Service Provider (ISP) 3. 10. 2013

  5. The Internet Web system • Definition: The World Web (WWW) is a system of Internet servers that store and allow access to hypertext documents • An access to the Internet service is specified by means of URL (Uniform Resource Locator) • ex.: http://is.mendelu.cz/auth/ 3. 10. 2013

  6. URL – Uniform Resource Locator 3. 10. 2013

  7. Principle of the Web • The Web uses individual Web pages usually combined to make up Web sites. • Web pages are (mostly) written in HTML. • HTML tells the Web browser how to display the page and its elements. • Web pages are stored in Web servers and their copies are sent on demand to Web browsers. 3. 10. 2013

  8. Key concepts of the Web • Hypertext Transfer Protocol (HTTP) on the client/server communication model • Hypertext Markup Language (HTML) • Uniform Resource Locator (URL) • Common Gateway Interface (CGI) 3. 10. 2013

  9. Principle of the communication within the Web system 3. 10. 2013

  10. Web server & Web browser • Web server – program that, using client/server model and the HTTP, servers the files that form Web pages to Web users • Most popular Web servers are Apache, and Microsoft’s Internet Information System (IIS) • Web browser – an application program that provides a way to look at and interact with all the information on the WWW 3. 10. 2013

  11. The Common Gateway Interface (CGI) • CGI is an standard way for a Web server to pass a Web client’s request to an application program and receive data back to forward to the user. • When user fills out a form on a Web page and sends it, the input usually needs to be processed. • The Web server passes the form information to an application program that processes the data and may send back some message. 3. 10. 2013

  12. Server-side & Client-side scripts • Server-side • Requests from users are interpreted by server • The page is sent in final form • PHP, ASP • Client-side • User requests are processed in browser • The page could be influenced by browser settings • Scripts are potentially dangerous for computer • JavaScript, Flash, Java 3. 10. 2013

  13. Searching services on the Web • deals with navigation through the Web space • The Web searcher (Google, Yahoo!, Bing, Seznam) interacts with a user which enters the keywords determining the subject of his/her interest. • The searcher seeks in its databases and then generates the list of the links to wanted information. 3. 10. 2013

  14. That’s all. • Questions? 3. 10. 2013

More Related