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The Cisco Certified Network Associate (CCNA) methodology. CCNA use the OSI Reference Model which has 7 layers:
Layer 1 Physical – this layer indicated the standards from other organisations referred by OSI. It deals with the transmission medium physical characteristics
Layer 2 Data link – This layer is concerned with getting data across a particular medium or link
Layer 3 Network – This outlines the end-to-end delivery of packets
Layer 4 Transport – This layer includes the choice of protocols that can provide error recoveries
Layer 5 Session – This layer outline how to start, control, and end sessions (conversations)
Layer 6 Presentation – This shows data formats, including; EBCDIC text, ASCII text, binary, JPEG, and BCD
Layer 7 Application – This explain how an application communicates with other computers by implementing OSI application layer concepts
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