The OSI module is a crucial component of networking since it is the only method to comprehend how software interacts with servers and responds to services that are requested by company or other hosts through a network.

But, before diving into the OSI module, it is important to first comprehend what OSI actually is and how it functions. 

The seven levels that computer systems employ to interact over a network are described by the Open Systems Interconnection (OSI) model.

Early in the 1980s, all significant computer and telecommunications businesses accepted it as the first industry standard for network communications.

The simplified TCP/IP model, rather than OSI, is the foundation of the modern Internet.

The OSI 7-layer model is still extensively used, nevertheless, as it aids in both isolating and troubleshooting networking issues as well as helping to depict and convey how networks function. 

Although it is not necessary to grasp how this networking aspect works for real-world projects, interviews, or any other job duties, it is still a good idea because it will help you develop your networking skills. 

There are basically seven (7) rules in the OSI model, or you could say that it's a mechanism to communicate with the host and its servers. 

Every layer in these seven (7) layers has a specific job to accomplish in order to establish connection with the host. If any one layer in this OSI Model stops functioning, communication will break down or you won't be able to connect to the host. 

Now let's understand the work of every single layer in complete details:-

Application Layer:- End-user applications like web browsers and email clients operate at the application layer.

It offers protocols that let computer programmes transmit and receive data and give consumers useful information.

The Hypertext Transfer Protocol (HTTP), File Transfer Protocol (FTP), Post Office Protocol (POP), Simple Mail Transfer Protocol (SMTP), and Domain Name System are a few examples of application layer protocols (DNS). 

Presentation Layer:- Data is prepared for the application layer by the presentation layer.

In order for data to be correctly received on the other end, it specifies how two devices should encode, encrypt, and compress data.

Any data transmitted by the application layer is processed by the presentation layer before being delivered via the session layer. 

Session Layer:- The session layer establishes sessions, or channels of communication, between devices.

It is in charge of starting sessions, making sure they are active and open while data is being exchanged, and shutting them down once communication is complete.

The session layer can also establish checkpoints during a data transmission, allowing devices to pick up where they left off in the event that the session is terminated. 

Transport Layer:- Data transferred in the session layer is divided into "segments" by the transport layer at the receiving end.

On the receiving end, it is in charge of putting the segments back together in order to create data that the session layer may use.

The transport layer performs error control, which determines whether data was received wrongly and, if not, requests it again, as well as flow control, which sends data at a pace that matches the connection speed of the receiving device. 

Network Layer:- The network layer serves two primary purposes.

One is dividing segments into network packets, which are then put back together at the other end.

The alternative method of packet routing involves finding the optimum route through a physical network.

In order to route packets to a destination node, the network layer needs network addresses, which are commonly Internet Protocol addresses. 

Data Link Layer:- The data link layer creates and breaks connections between two network nodes that are physically close to one another.

Frames are created from packets, which are then sent from source to destination.

This layer is made up of two components: Media Access Control (MAC), which utilises MAC addresses to connect devices and specifies permissions to transmit and receive data, and Logic Link Control (LLC), which identifies network protocols, does error checking, and synchronises frames. 

Physical Layer:- The physical layer is in charge of the wired or wireless connections that physically connect network nodes.

In addition to defining the connector, the electrical cable or wireless technology connecting the devices, it is in charge of bit rate regulation and the transmission of raw data, which is just a stream of 0s and 1s. 

So maybe now you have understand the rules and about the OSI model. 

We will discuss more about it on upcoming blogs so please if you like my blog just follow me.

The Open Systems Interconnection (OSI) model describes seven layers that computer systems use to communicate over a network.

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Trending Blogposts on osi model

Here is the complete OSI module description from the networkin blog.

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