1.4.          91

,     .      , 
 MAN      ,  -
 .

        
 ()      -
. -         
        -
 .     frame relay.    -
,      ,    
,   ,    ,  
 ,        frame relay.

     , ,  , -
     ,     
       
    (  frame relay   -
 2 /),        ,  622 /.

     on-line     
.        World
Wide Web,       Internet.  -
      
 ,        -
     .     
        ,  
    intranet- (intra  ), -
    ()     .

        .
    (Fast Ethernet, Gigabit Ethernet, lOOVG-AnyLAN)
        
    .   
       
.        -
 ,  ,      :  -
  ,     
,        -
   . .     ,  ,
       , -
   .      -
  ,     Ethernet  Token Ring.

          
      , 
   .    ,    -
  ,         
 .          -
,  ,   , -
     .

 ,   ,   
  .      
  ,        