《计算机导论》课程教学课件（英文讲稿）7-a- Web

Web Technology Web Basics: www(world wide web) HTTP(Protocol) podcast:is an audio file that distributed through downloads or the use of feed.E.g.RSS(Really Simple Syndication)or Atom -Videocasting:is an video file that distributed through downloads or the use of feed. Web server web browser hypertext link URL(Uniform Resources Locator) -HTML markup language)

Web Basics: - www (world wide web) - HTTP (Protocol) - podcast: is an audio file that distributed through downloads or the use of feed. E.g. RSS(Really Simple Syndication) or Atom - Videocasting: is an video file that distributed through downloads or the use of feed. - Web server - web browser - hypertext link - URL(Uniform Resources Locator) - HTML ( markup language) Web Technology

Web Technology How does HTTP work? HTTP Request and Response 1.Browser Request 2.Web Server Finds File GET/indexhtml HTTP/1.1 1KB /var/www//indexchtml Read File 3.Server Response 4.Browser Displays Page 100K6 HTTP/1x200OK chtmb>. Stateless protocol: Each web page retrieved separately,the HTTP maintain no record of pervious interactions and handels each request based entirely on information that comes with it

How does HTTP work? Stateless protocol: Each web page retrieved separately, the HTTP maintain no record of pervious interactions and handels each request based entirely on information that comes with it. Web Technology

Web Technology Web cache: is a temporary files contain the materials when your browser fetches pages and graphics to form a web page,it stores that material in these file. Cookies: is a small chunk of data generated by a web server and stored in a text file on computer. the cookie information can include a customer number,domain name of the host that created the cookies. cookies wil be stored in C:\Documents and Settings. ActiveX control: Is a complied computer program that can be refernced from within an HTML document,downloaded,installed on your computer,and excuted within the browser Windows

Web cache: is a temporary files contain the materials when your browser fetches pages and graphics to form a web page, it stores that material in these file. Cookies: is a small chunk of data generated by a web server and stored in a text file on computer. the cookie information can include a customer number, domain name of the host that created the cookies. cookies wil be stored in C:\Documents and Settings. ActiveX control: Is a complied computer program that can be refernced from within an HTML document,downloaded, installed on your computer, and excuted within the browser Windows. Stateless protocol: Each web page retrieved separately, the HTTP maintain no record of pervious interactions and handels each request based entirely on information that comes with it. Web Technology

Search Engines Google Altavista Ask.com

Google Altavista Ask.com Search Engines

E-commerce E-commerce: typically refers to business transactions that are conducted electronically over a computer network. e.g.B2B,B2G,B2C,and C2C. Hosting advertising Banner ad:is advertisement,typically embedded at the top of a web page. Pop-up ad:is an advertisement that appears in a separate windows when you connect to a web page. Click-through rate:the number of times that site visitors click the ad to connect to the advertise's site. Benefit of e-commerce:globale Businesses

E-commerce: typically refers to business transactions that are conducted electronically over a computer network. e.g. B2B, B2G, B2C, and C2C. Hosting advertising : Banner ad: is advertisement , typically embedded at the top of a web page. Pop-up ad: is an advertisement that appears in a separate windows when you connect to a web page. Click-through rate: the number of times that site visitors click the ad to connect to the advertise’s site. Benefit of e-commerce: globale Businesses E-commerce

Online Payment Secure connection: encrypts the data transmitted between your computer and a website to protect your credit card. technologies that create secure connection include SSL,TLS and S-HTTP. SSL(Secure Sockets Layer): TLS(Transport Layer Security): Are protocols that encrypt data travelling between a client computer and an HTTP.These protocols using a specially designated port-typically port 443 rather than port 80. How you know if a connection is secure? https://www.google.com In taskbar display a padlock icon. Page:390

Secure connection: encrypts the data transmitted between your computer and a website to protect your credit card. technologies that create secure connection include SSL,TLS and S-HTTP. SSL(Secure Sockets Layer): TLS(Transport Layer Security): Are protocols that encrypt data travelling between a client computer and an HTTP. These protocols using a specially designated port-typically port 443 rather than port 80. How you know if a connection is secure? https://www.google.com In taskbar display a padlock icon. Page: 390 Online Payment

E-mail E-mail message: Is a document that is composed on a computer and remains in digital,or electronic form so that be transmitted to another computer. E-mail.(Practice) READ SEND/REPLY/ FORWARD Attachments mail.yourcomparcom Send carbon copy FORWARD Send a blind carbon copy E-mail system: SMTP pop3 yourcomparcom E-mail server Firewall POP3 PoP server and SMTP server. Service-now Instance Server Page:398

E-mail message: Is a document that is composed on a computer and remains in digital, or electronic form so that be transmitted to another computer. E-mail.(Practice) Attachments Send carbon copy Send a blind carbon copy E-mail system: E-mail server PoP server and SMTP server. Page: 398 E-mail