468     6   

      ,  
      .  ,
     ,    
  ,       
       (business-critical
applications).        -
  .          
 ,        -
   .

       
    2  622 /,     IP, IPX
   SNA  IBM,    
frame relay, ATM, X.25  TCP/IP.      -
       -
 ,     . 6.5.

/<   -~~~~[  /  /s. ^   '^/ ( )	'"'-.,<-''	\ \2-622 /' /   (  
	\\^^ /~~\ ^~'--~--	
		
	^- frame relay '1"'-,^^   64 / - 2 /	
			
			
				
?   ^--' <   /'	

. 6.5.    