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iso osi strack (Data link layer (functionalities (Framing (what is SFD…

- - - - what is SFD (start o freame delimitter)
        
        it tells a station if the transmitting frame is meant for it or not ; if not it will not check again during the transmission
        
        marks the starting of the frame
      - framing types
        
        Variable length
        
        var lenth frames
        
        need to tell beginin and end of frame
        
        how end of frame told
        
        we can specify lenth in a field
        
        we can use and END DELIMMITER like SFD
        
        2 more items...
        
        fixed length
        
        less used (give a read)
  - - - i.e MAC adres
  - - - Takes care of Flow control
    - - takes care of framing, access control and physical adresin
    - - error control
- - - - i.e Ip adres
- - - - differential manchester
        
        1
        
        0
      - manchester encoding
        
        1
        
        0
      - band rate
        
        number of voltages sent per sec
        
        bandrate = 2 * bit rate
    - - simplex
      - half duplex
      - full duplex
    - - bus
      - star (most common)
      - hybrid
      - mesh
      - ring