• _{CSMA (carrier sense multiple access)}
  • _{collision detection is necessary when multiple stations send messages}
• _polling
  • _{no longer used as a lan protocol}
• _{token passing}
  • _{a 24 bit packet that circulates the network}
  • _{when a work station wants to transmit it seizes the token}
  • _{a workstation may only transmit if it has the token}
• _{switched environment}