osi model
7 - application - human/computer interaction layer 6 - presentation - ensures data is in usable format - where encryption occurs 5 - session - maintains connections and is responsible for ports & sessions 4 - transport - transmits data using transmission protocols e.g. TCP and UDP 3 - network - decides which physical path the data will take 2 - data link - defines the format of the data on the network 1 - physical - transmits raw bit stream over the physical medium
mnemonic - all people seem to need data processing
osi - open systems interconnection