 3.       DNS________________131

 DNS

       
 ,       
.      -   -
 , IP-,   
"" .

      ,    Internet,
     ,    . -
         
.       
,       
 .

     ,   
    . -
         
 ,    .    
     Internet,   
 .

       ,
   Internet ( ,  , 
 ).     -
        
,       .
        -
      .

   ,     
   ,     -
, . .  -      -
  ,          -
.          ,
 -  ,     .
 ,       -
   .    -
   .

        (master files),
        -
.        -
 " " (name server)  . -
        ,
 " " (resolves).

       -
   , , FTP    . 