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Web browsing

Web browsing. Navigating, reading, interacting. 1.Web browser e.g IE,Firefox. Send request. 2.Web server. Other file e.g: animation,video. Web page. Extra use: Blocking pop-up ad. video. Small portion. streaming. computer. Codec

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Web browsing

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  1. Web browsing • Navigating, reading, interacting 1.Web browser e.g IE,Firefox Send request 2.Web server Other file e.g: animation,video Web page Extra use: Blocking pop-up ad

  2. video Small portion streaming computer Codec ‧specific program for decoding different format video, e.g MP4 ,AVI Plug in: Real player, window multimedia player Media player

  3. File transfer • File Transfer Protocol ASCII: Plain text is sent Log in Upload & download 1.user 2.FTP program Binary: 1.Transmit byte by byte 2.Receive all and store Allow user to use command to control e.g put & get

  4. Security problem • no method specified for transferring data in an encrypted(加密) fashion • Password, username may be seen by hijacker use packet sniffer(嗅探)

  5. E-mail • Transmission of digital documents from computer to email server • Must be address correctly userid@domain.com User ID Mail server name

  6. write email send E-mail program receive Store in reply print mail server delete Advantage: Speed: deliver without a short period Convenience: anytime, send to large group Flexibility: attach any type of digital file Disadvantage: Spread of virus Receive unwanted email (advertisements) forward Log in user mailbox

  7. HTML email • Advantage: • include inline links and images • change font styles • use emphasis such as underline and italics Disadvantage: ‧increased size of the email ‧privacy concerns about web bugs ‧be a vector for phishing(釣魚) attacks

  8. dedicated email program • Outlook express • Advantage: • Easy to use • Many people use • Disadvantage: • System problems cause spreading of virus

  9. Video-conferencing • Allow two or more people at different location to communicate • Real time • Over the internet • Quality of visual and audio signals • Bandwidth of communication channel

  10. Delay of signals cause distortion to video and audio • Make the communication unintelligible (Lag機) • Included web camera and microphone • Software is used for control the camera • e.g Microsoft NetMeeting

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