4.4.            329

      ,   -
 ,        -
  ,       , 
    .      
          -
.     Ethernet    FDDI,
             ,
 ,    ,  ,   -
 .

        -
    ,      
      .

         
Ethernet ( Fast Ethernet,     Ethernet)  -
 FDDI  Token Ring     (, 
) .

            Length
     FDDI  Token Ring   Ethernet 802.3 ( 
FDDI  Token Ring   ).

          FDDI  Token
Ring   Ethernet.  FDDI  Token Ring   , -
 ,   ,      
   .      
  ,  ,       -
,    .      -
            , 
    -.   -
      .

  ,    FDDI  Token Ring  
Ethernet     ,  1500 ,    -
       Ethernet.  , 
       Ethernet,  
    FDDI, ,    
  ,        -
 .      
 IP-,   , -,   -
   ,  -,   IP -
   .

   Type (    )  Ethernet  
   ,   FDDI  Token Ring, 
   ,    DSAP  SSAP, -
   ,       . 
   RFC 1042   -
   FDDI  Token Ring    LLC/SNAP, 
    Type     ,    Ethernet . 
     Type  LLC/SNAP -
   Type  Ethernet ,  .    Ethernet 