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Wednesday, 02 December 2009 16:53 |
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The Seven Layers of the OSI Model | 7 | Application
Network Process to Application | | - Provides network services processes to application processes (such as electronic mail, file transfer,...)
- Provides user authentication
| | | | | | | 6 | Presentation
Data Representation | | - Ensures that data is readable by receiving system
- Formats data
- Structures data
- Negotiates data transfer syntax for application layer
- Provides encryption
| | | | | | | 5 | Session
Interhost Communication | | - Establishes, manages, and terminates sessions between applications
| | | | | | | 4 | Transport
End-to-end Connections | Segment | - Handless transportation issues between hosts
- Ensures data transport reliability
- Establishes, maintains, and terminates virtual circuits
- Provides reliability trough fault detection and recovery flow control
| | | | | | | 3 | Network
Data Delivery | Packet | - Routes data packets
- Selects best path to deliver data
- Provides logical addressing and path selection
| | | | | | | 2 | Data Link
Access to Media | Frame | - Defines how data is formatted for transmission and how access to the network is controlled
- Provides error detection
| | | | | | | 1 | Physical
Binary Transmission | Bit | - Defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating physical link
| Encapsulation 7 -> 1
De-Encapsulation 1 -> 7
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