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18.3-18.4 Internet Services and Steaming Technology on the Internet

18.3-18.4 Internet Services and Steaming Technology on the Internet. Annie 5C (17). What is/are included in Internet services?. World Wide Web (WWW) FTP e-mail remote logon online chat discussion forums Newsgroups. 18.3.1 World Wide Web. Most widely used Internet service

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18.3-18.4 Internet Services and Steaming Technology on the Internet

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  1. 18.3-18.4 Internet Services and Steaming Technology on the Internet Annie 5C (17)

  2. What is/are included in Internet services? • World Wide Web (WWW) • FTP • e-mail • remote logon • online chat • discussion forums • Newsgroups

  3. 18.3.1 World Wide Web • Most widely used Internet service • browsing by IE, Safari, etc. • Transmitted by HTTP • use other relevant application software programs to open the file • e.g. Adobe PDF Reader (PDF file), RealPlayer (video)…

  4. Multimedia Elements on the WWW • usually composed of a large variety of multimedia elements • In graphics • Bitmap graphic file format: BMP, JPG, GIF, PNG • Vector graphic file format: SWF, WMF, EPS • In audio • stored in compressed format • WAV, WMA, MP3, AAC • support audio streaming • In video • WMV, RM, MOV • all support video streaming

  5. Media Players • Play the audio and video file downloaded from the Internet • Windows Media Player, RealPlayer, QuickTime Player, i Tunes, etc.

  6. Plug-ins • Allow to play audio or video file on web browser • keep the web browser efficient and its file size small • Up-to-date Popular Plug-in application Flash player, Shockwave Player, QuickTime, RealPlayer

  7. 18.3.2 File Transfer Protocol Popular way to transfer files on the Internet servers and clients are involved in an FTP transfer

  8. User’s Authentication • Need a username and a password to login • Anonymous FTP • anyone can access the FTP server without login accounts

  9. File Transfer Mode • ASCII • Send plain text • Binary • Transmits the file bit by bit • Reassembles the bit stream into a single file after transfer complete

  10. Command Line Interface • Put • Upload a file from a computer to an FTP server • Get • Download a file from an FTP server to a computer • allow user to manage file transfers in batch

  11. 18.3.3 E-mails Transmit from through mail servers Run an e-mail program Email address format Francescahi@hotmail.com User ID Mail server domain name

  12. SMTP (Simple Mail Transfer Protocol) • Most popular protocol • Communication btw two mail servers • not allow receiver’s mail server to request e-mails from the sender • Disadvantage: • unable to authenticate email sender • Lead to spam and computer viruses spread by e-mail • transmit of ASCII text-based messages

  13. POP (Post Office Protocol) • most widely used e-mail transmission standard for large organizations • allow user download to their mailbox • can read email anytime

  14. IMAP (Internet Message Access Protocol) • More advanced alternative to POP • Store all of e-mails on the mail server • Advantage: • accept more than one user access the same mail box at the same time • can access the same mail box in different web browser or e-mail program

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