OSI 7 Layer Model PDF
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This document provides a breakdown of the OSI (Open Systems Interconnection) 7-layer model. It details each layer's function and interaction, crucial for networking concepts. It serves as a clear guide for those studying or working with computer networking.
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# Communication ## OSI (Open Systems Interconnection) 7 Layer Model | Layer | Application/Example | Central Device/ Protocols | |---|---|---| | **Application (7)** | End User layer Program that opens what was sent or creates what is to be sent <br> Resource sharing. Remote file access. Remote prin...
# Communication ## OSI (Open Systems Interconnection) 7 Layer Model | Layer | Application/Example | Central Device/ Protocols | |---|---|---| | **Application (7)** | End User layer Program that opens what was sent or creates what is to be sent <br> Resource sharing. Remote file access. Remote printer access. Directory services. Network management | **User Applications** <br> SMTP | | **Presentation (6)** | Syntax layer encrypt & decrypt (if needed) <br> Character code translation. Data conversion. Data compression. Data encryption. Character Set Translation | JPEG/ASCII <br> EBDIC/TIFF/GIF <br> PICT <br> **Logical Ports** <br> RPC/SQL/NFS <br> NetBIOS names | | **Session (5)** | Synch & send to ports (logical ports) <br> Session establishment, maintenance and termination. Session support - perform security, name recognition, logging, etc. | | **Transport (4)** | TCP Host to Host, Flow Control <br> Message segmentation. Message acknowledgement. Message traffic control. Session multiplexing | TCP/SPX/UDP <br> **Routers** <br> IP/IPX/ICMP | | **Network (3)** | Packets ("letter", contains IP address) <br> Routing. Subnet traffic control. Frame fragmentation. Logical-physical address mapping. Subnet usage accounting | | **Data Link (2)** | Frames ("envelopes", contains MAC address) [NIC card - Switch - NIC card] (end to end) <br> Establishes & terminates the logical link between nodes. Frame traffic control. Frame sequencing. Frame acknowledgment. Frame delimiting. Frame error checking. Media access control | Switch <br> Bridge <br> WAP <br> PPP/SLIP <br> **Hub** <br> Land Based Layers| | **Physical (1)** | Physical structure Cables, hubs, etc. <br> Data Encoding. Physical medium attachment. Transmission technique - Baseband or Broadband. Physical medium transmission Bits & Volts | Source: OSI 7 layer model
