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What is the OSI Model And Its Layers?

With the development of technology, it has become much easier to reach our loved ones. Whether it's seeing loved ones or for a work meeting, phones have become a part of our lives during the day and a great comfort to our lives. In particular, due to the pandemic, there was a noticeable increase in these negotiations. So how does the person at point X hear us when we're talking at point A? There's a lot of effort and software behind all the phone calls. OSI (Open Systems Interconnection) model determines how audio transmission between computers is performed correctly by layering it.

There are 7 layers in the operation and transfer of this type of data, which are called OSI (Open Systems Interconnection).

The OSI Model Layers

1-Physical Layer

It shows the structure of the data on the cable, i.e. how it will proceed. This layer helps to transfer and translate one and zeros into electrical, light or radio signals. However, for this, both sides must have the appropriate infrastructure.

2- Data Link Layer

It determines the methods for the use and access of the physical layer. It also checks where incoming signals come from and errors in signals coming from the physical layer.

3- Network Layer

The network layer provides data transmission in the most convenient way between the two directions. In this way, it allows the data to be transmitted through the router.

4- Trasport Layer

Data packet delivery and error checking are handled by the transport layer. It controls the size, sequencing, and ultimately the data transfer between systems and hosts. The Transmission Control Protocol (TCP) is one of the most common examples of the transport layer.

5- Session Layer

It helps transfer incoming and outgoing data to the right places. Allows them to be separated when we make multiple connections or calls. NetBIOS is used with systems such as RPC, Named Pipes, and Sockets.

6- Presentation Layer

This layer formats and decrypts data, transforming it into suitable for applications and enabling it to be presented.

7- Application Layer

This layer performs the final operation Thanks to the application layer, the communicating IPs are determined and adapted, and transferred according to the media used in the final form.

The relationship between OSI layers is that each layer supporting the previous one. The received data is divided into sections in the transfer layer. So when it comes to receivers, the data is sorted correctly.

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