The OSI (Open Systems Interconnection) Layers - tccicomputercoaching.com

The OSI (Open Systems Interconnection) Data Model

ISO standard for computer networks design and functioning. -Involves at least 7 layers, each playing a specific role when applications are communicating over the net.

During the sending process, each layer (from top to down) will add a specific header to the raw data.
At the reception, headers are eliminated conversely until the data arrived to the receiving application.
16 OSI Layers Physical layer (defines the physical characteristics of the network)

Physical layer : ensures a safe and efficient travel of data; consists of electronic circuits for data transmission etc.

Data link layer : in charge of data encapsulation under the form of packets and their interpretation at the physical layer.

Network layer : in charge of packets transmission from a source A to a destination B.

Transport layer : in charge of the delivery of packets from a source A to a destination B

Session layer : in charge of the management of network access.

Presentation layer : determines the format of the data transmitted to applications, data compressing/decompressing, encrypting etc.

Application layer : contains the applications which are used by the end-user, such as Java, Word etc.

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