• Application - e.g.NFS, NIS
  • Presentation - e.g. XDR, structures the data
  • Session - e.g. RPC, executes procedure calls remotely. Presentation and Session together control the creation and lifetime of connections and data format
  • Transport - e.g. TCP, UDP, ensures data is suitable size for network and provides transmission control. TCP monitors transmission and lost packets are resent. UDP doesn't monitor and it is up to the receiving app to request the resending of lost packets
  • Network - e.g. IP, responsible for getting packets from A to B
  • Datalink - how data is put into chunks
  • Physical - gets packets to or from network. Datalink and Physical together define the network interface, e.g. ethernet

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