Seven Layers of the OSI Model

lc-root | September 16, 2011 | How To | No Comments

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