18                      __ _______________________ Internet

 .      -
      .  
      -
 ,        -
 .        
UseNet,       , -
  Internet,     UseNet.  
UseNet      ,  
     UseNet,  
.        , -
   .  UseNet     -
 ,      
   ,   
(, ). ,  UseNet, 
Network News Transport Protocol (NNTP). NNTP    -
  ,     
  ,    -
 UseNet.

 World Wide Web (WWW)   ,   -
 ,       -
   .     -
 ,    Internet
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.  , WWW    -
,    ,  ,
  WWW,     
 . WWW    -
     HTTP.    -
   WWW,  ,   
 WWW,      -
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"   Internet, HTTP  
,     .

   (FTP)        -
 Internet.         
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  - ,     -
      ,   -
 FTP-.    FTP   "
"   SFTP  TFTP.     
,   FTP,       
  .

     .   -
 (TELNET)     
 ,   TELNET.   