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COMMUNICATION PROTOCOLS pag. 216 - Coggle Diagram

- - - - OPEN SYSTEM INTERCONNECTION
        
        it consists of
        
        7 layers
        
        LOWER LAYERS
        
        1 PHISICAL
        
        acivates, mantain and desactivates the physical connection
        
        1 more item...
        
        2 DATA LINK
        
        syncronises info
        
        ckecks that data transmission is error free
        
        checks sequentiality of data
        
        3 NETWORK
        
        routes signal through different channels
        
        UPPER LAYERS
        
        4 TRANSPORT
        
        decides parallel or single path
        
        converts mess. into smaller units
        
        5 SESSION
        
        manages and synchronises the conversation between differet applications
        
        6 PRESENTATION
        
        ensure legibility of data
        
        7 APPLICATION
        
        holds application programs
  - - - throught compatible systems