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OSI Model Layers | Open Systems Interconnection

The open system interconnection OSI Model Layers began a reference model, but has since been implemented. It was created by international organisation for standardization OSI to provide a logical framework for how data communication processes should interact across networks. Standards were created for the computer industry allowing different networks to work together efficiently.

How many OSI Model Layers are?

There are 7 layers in the OSI Model. Each layer is responsible for a particular aspect of data communication. For example, one layer is may be responsible for establishing connections between devices, while another layer maybe responsible for error checking during transfer.

The layers of the OSI Model are divided into two groups: the super layer and lower layer. The uper layer focus on user application and how files are represented on the computers prior to transport. For the most part, network engineers are more concerned with the lower layer. It’s the lower layers that concentrate on how the communication across a network actually occurs.

Application OSI Model layer:

one of the important OSI model layers is Application Layer. Provide network services to user applications. It is responsible for exchanging information between programs running on the machine, such as an e-mail program, and other services running on a network such as a print server or another computer’s application.

Presentation OSI Model Layer:

Concerned with how data converted and formatting for data transfer, Examples of format conversion include ASCII text for documents and .gif and JPG for images. This layer performs code conversion data translation, compression and encryption.

Session model layer:

Determines how two devices establish, maintain and manage a connection – how they talk to each other. These connections are called sessions.

Transport layer OSI Layer:

 Responsible for  breaking the data into segments establishing an end-to-end logical connection between Machines, and providing for error handling.

Network layer:

Responsible for determining on the network determining the routes that information will take on its journey, and managing network traffic congestion. Data and this level is packaged into packets.

Data link layer:

Provide the link for how data, packaged into frame is communicates through hardware to be transported across a medium. It communicates with network cards, manages physical layer communications between connecting systems and handles error notification.

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