Briefly OSI seven layer model


OSI is an abbreviation for Open Systems Interconnection. A model for OSI (implying that equipment from any manufacturer can be connected to any other manufacturer’s equipment).

Application layer

-This is the highest level,closest to the user.

-It supports the transfer of information between end-users, applications programs and devices.

-Several types of protocol exist in this layer, covering specific and general applications such as accounting, entry control and user identification.

Session layer

-It is the user’s interface into the network.

-When a user requests a particular service from the network, the session layer handles the dialogue.

Transport layer

-It handles the data transmission between host computers.

-Dealing with addressing and error controls to ensure a high quality data transmission service for the network.

Network layer

-The function of the network layer is to perform the routing of information around the network.

-Connecting adjacent nodes in the network.

-Carrying out accounting functions to enable the network owner to charge users.

Data link layer

-The physical data transmission media used in a network are subjected to interference which can corrupt data, and this layer handles data transmission errors.

-The techniques used for receipt and acknowledgment of data by a receiver are handled in this layer

Physical layer

-This layer is concerned with standards for the mechanical, electrical and procedural aspects of interface devices; for example, the number of pins a network connector should have.

-It is concerned with how the binary data is transmitted along the communication channel.

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