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Layer 7: Physical
This layer defines the electrical and physical specifications for the networking media that carry the data bits across a network.
Layer 6: Presentation
This layer is concerned with data representation and code formatting
Layer 5: Session
The Session layer establishes, maintains, and manages the communication session between computers.
Layer 4: Transport
The functions defined in this layer provide for the reliable transmission of data segments, as well as the disassembly and assembly of the data before and after transmission
Layer 3, Network
This is the layer on which routing takes place, and, as a result, is perhaps the most important OSI layer to study for the CCNA test. The Network layer defines the processes used to route data across the network and the structure and use of logical addressing.
Layer 2: Data
Link: As its name suggests, this layer is concerned with the linkages and mechanisms used to move data about the network, including the topology, such as Ethernet or Token Ring, and deals with the ways in which data is reliably transmitted.
Layer 1: Physical
The Physical layer's name says it all. This layer defines the electrical and physical specifications for the networking media that carry the data bits across a network.
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