5.3.  IP     409

  0,     2800.      
,  ,     .   IP-
  2800  20 ( IP-),   2820 ,  -
     FDDI.   IP  1  
    (   -
 1    1).     -
 .

|		 1		 2			
		 		 			
									
											.J	
		IP								IP		
												
						IP						
		1								2		
		1								2		
								1	2								
								1	2								
																		
				1								 2				
			3 		-						""1 " -iJL			
				11-						- 				
	--<													



-

- 

. 5,21.  IP-         :

1  1       1; 2  2 -      2

 ,       
(1  1)     FDDI,  IP    -
,         2,   
Ethernet    MTU,  1500. ,  IP--
  .      -
      ,       
 Ethernet.     IP-,    
 1400 + 20 = 1420 ,   1500 ,    -
     Ethernet.

    2   Ethernet   IP-  -
  486,    IP,   -
 2,    .      
,    ,      
.

,  IP-       -
 ,      ,   .
   ,       
   ,   ,   
  -     .