 7.     FTP________________________251

      .
 ,       -
,       ,
     , 
 .        -
,       -.  -
      :

 PORT.      ,   -
        .
   32- IP-  16- 
 .      8-  
   : hi, h2, h3, h4, pi, p2,  hN  -
  (   ), a pN    (  
).   ,               
10.145.56.1:1997,  PORT    :

PORT 10, 145, 56, 1, 7, 205

D PASV.    ,    -
    , . . "" .  
    ,     ,
       
PORT - "hi, h2, h3, h4, pi, p2".

]  TYPE, STRU, MODE , ,  -
  (ASCII, Image  .),    
 (File, Record, Page),   (Stream, Block  .). -
        
       
  .    ,
      FTP   , -
,  RFC-959.

 FTP-  ,   -
   .  ,    
   .     
       
 .   FTP-   :

 RETR.     "Server-DTP"   -
,    ,    
  .

 STOR.    "Server-DTP"    -
       ,   
  .     ,  
 ,  ,        -
  .