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List the layers of the OSI model.
- Physical
- Datalink
- Network
- Transport
- Session
- Presentation
- Application
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Application layer
Interfaces between network and application software. Includes authenticatin services.
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Presentation layer
Defines format and organization of data. Includes encryption.
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Session layer
Establishes and maintains end-to-end bidirectional flows between end points. Includes managing transaction flows.
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Transport layer
Provides a variety of services between two host computers including connection establishement and termination, flow control, error recovery, and segmentation of large data blocks inter smaller parts for transmission.
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Network layer
Logical addresssing, routing and path determination.
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Datalink layer
Formats data into frames appropriate for transmission onto some physical medium. Defines rules for when medium can be used. Defines means by which to recognize transmission errors.
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Physical layer
Defines electrical, optical, cabling, connectors and procedural details required for transmitting bits represented as same form of energy passing over a physical medium.
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