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17 - LAN Media Access - Coggle Diagram

- - - - Mechanisms to detect and manage collisions
      - Ex: Carrier Sense Multiple Access with Collision Detection (CSMA/CD), Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
        
        CSMA
        
        Host check whether media is in use,
        transmit and
        wait for acknowledgement
        
        CSMA/CD
        
        Host check whether media is in use,
        transmit,
        while transmitting listens for collisions,
        if collision, then transmit a jam signal,
        if a jam signal is received, then all hosts stop transmitting
        and wait for a random period
        
        CSMA/CA
        
        Host check whether media is in use on the inbound connection
        If not use, then host requests permission to transmit
        If permission is not granted after a timeout period, host restart
        If permission is granted, host transmits its communication over the outbound connection
        host waits for acknowledgement
        If no acknowledgement, then back to step 1
        
        The host has two connections to the LAN media: inbound and outbound
    - - Token passing
        
        Possession of the token allows a host to transmit data
        
        Once transmission is completed, it releases the token to the next system
      - Polling
        
        One system is labeled as primary system and all others as secondary.
        Primary system polls or inquires of each secondary system in turn whether they have a need to transmit data.
        If a secondary system indicates a need, it is granted permission to transmit.
        Once transmission is completed, the primary system moves on to poll the next secondary system