566     6   

        , 
        
   .



          .25,
frame relay, SMDS,   TCP/IP.   ,   TCP/IP, -
  ,      -
  .

  TCP/IP       ,
         ,  
      .  ,  TCP/
IP     ,   -
  .

        -
   .       -
       , 
 .     
        , -
        .

          
   ,    IP  IPX.
 :      -
 ,      ,  ,  
.       -
       ,   -
       .

  .25         
 .     .25  
    ,    
      .

  .25       -
         PAD,
        .

   -   .25  -
  ,       
 .

  frame relay     ,    -
 .25, ,       
   LAP-F.       -
 , -      .

    frame relay   -
        . 
frame relay      -