Domain 2, “Network Security and Telecommunications”
ISO/OSI Seven-Layer Model
The ISO/OSI seven-layer model defines the fundamental aspects of how all network communication occurs. The OSI model exists to enable the user to understand the totality of a very complex system of communications by breaking the overall transmission of data into seven easier-to-define layers:
Application layer— Primarily responsible for interfacing with the user. This is the application interface the user experiences. (POP3, NNTP)
Presentation layer— Primarily responsible for translating the data from something the user expects to something the network expects. (WAV, MIDI, JPEG, SMB)
Session layer— Primarily responsible for dialog control between systems and applications. ...
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