254     3     

      (  
  ).       ( 
Ethernet) ,       -
 .

    Gigabit Ethernet   , 
      ,    
        
       
 .      ,     -
,       ,  
 ,       
        .

        -
 Gigabit Ethernet - ,      
   ,  Spanning Tree,  -
  . .    ,    -
    ,       
 (,  )    -
.

      Gigabit Ethernet    -
 Ethernet  Fast Ethernet?

     Ethernet.

 -     , -
   CSMA/CD,   ,  
.       -
     Fast Ethernet,     -
  CSMA/CD   .    
   Fast Ethernet,       -
 Gigabit Ethernet.      
  Gigabit Ethernet    , 
    ,

     ,   Ethernet  Fast

Ethernet: -,    5, .

     Gigabit Ethernet   -
          -
,      Fast Ethernet,     MAC.

   Gigabit Ethernet    -
 .        
    .    , -
  CSMA/CD   ,  Gigabit Ethernet  -
        25    
     CSMA/CD .   
  ,        ~\
200 ,   -       -
    Fast Ethernet.

       1000 /
   .      