 7.     FTP________________________249

2. "User-PI"   "Server2-PI"     -
        "Serverl-PI"   (N).

3. "User-PI"   "Serverl-PI"  " 
  - ",   "Server2-PI"  " 
- ".

4.   "Serverl-DTP"  "Server2-DTP"   -
,    .

   FTP    -
       . -
  FTP-     
 .   "User-DTP"    ,   
  (  "U"), a "Server-DTP"   
L-1,  "L"   . ,  ,  -
    ,    "User-
IP",       ,
 "User-PI"   ,     "User-DTP",
   "Server-DTP".

     ,    
" ", ""    .  ,
    ,   -
 .

    ,  "Server-DTP"  "User-DTP"
 .    "Server-PI"  "User-PI" -
    .  FTP , 
   ,     
 .  FTP     
 .

(  J

        8 ,  
    ,     .

 ,  FTP       -
 .  FTP     
   :

1.      ,   
.

2.      " ".

3.      .

4.    .

5.  ,      .