OSI MODEL: Open System Interconnection
Hello friends, In this blog post(OSI MODEL) I am going to let you know about a very popular communication model that is the OSI model. It is also known as an open system interconnection model(OSI).
In this blog post(OSI MODEL), we are going to explore What is the purpose of the OSI model? What are the 7 network layers? What is the OSI model with an example? What are the 7 layers of security? What is the OSI model used for?….
…. Where does the OSI model exist? Where the OSI model is implemented? Which layer is the heart of the OSI model?|OSI MODEL|
OSI model is a layered framework for the design of a network system that permits communication across all kinds of computer systems. It has seven separate but related layers, each of which defines a segment of the process of moving information across a network.
Now, for a better understanding, of the fundamental of the OSI model see the below-given head categorization|OSI MODEL|
(OSI Model)Layered Architecture:
The OSI model is made of seven ordered layers which are also known as the physical layer, Data link layer, network layer, transport layer, session layer, presentation layer, and application layer. Fig 1 shows the architecture of the OSI model.
When the message travels from one device to another, it may pass through several intermediate nodes. Usually, these intermediate nodes involve only the first three layers of the OSI model.
In developing the model, the designers distilled the process of transmitting the data down to its most fundamental elements.
They identified the network functions that had related uses and collected those functions into discrete groups which became the layers. Each layer defines a family of functions that are distinct from those of the other layers.
By defining and localizing the functionality in this way, the designers developed an architecture that is both comprehensive and flexible. The most important thing is that the OSI model permits complete transparency between otherwise incompatible systems.
Every layer in the OSI model calls upon the services of the layer just below it within a single machine. For example, layer 3 uses the service given by layer 2 and gives service to layer 4. Between machines, layer x on the machine communicates with layer x on another machine.
This communication is governed by an agreed-upon series of rules and conventions known as protocols. A process on each machine that communicates at a given layer is known…
… as a peer-to-peer process. Therefore, communication between machines is a peer-to-peer process using the protocols suitable to a given layer.
The interface between layers:
In the OSI model, the interfaces between each pair of adjacent layers make possible the passing of the data and network information down through the layers of the sending machine. Every interface defines what information and services a layer must provide for the layer above it.
As long as a layer still gives the expected services to the layer above it, the specific implementation of its functions can be modified or replaced without needing changes to the surrounding layers.
Organization of the layers:
In the OSI model, the seven layers can be divided into three subgroups. The physical layer, data link layer, and network layer are the network support layers.
The physical aspects of moving data from one device to another device(such as electrical specification, physical connections, physical addressing and transport timing, and reliability) are dealt with by these devices.
The session layer, presentation layer, and application layer are the user support layers. They permit interoperability among unrelated software systems.
The transport layer ensures end-to-end reliable data transmission while the data link layer ensures reliable transmission on a single link.
The upper OSI layers are almost always implemented in software and the lower layers are a combination of hardware and software, except for the physical layer, which is mostly hardware.
What is the purpose of the OSI model?
The objective of the OSI model was to set the design standard for the manufacturer who could build such devices that can easily communicate with each other.
Which layer is the heart of the OSI model?
The transport layer is considered the heart of the transport layer.
Where the OSI model is implemented?
The OSI model is divided into two areas of layer one is the upper layer and the other is the lower layer. The main work of the OSI upper layer is to deal with application-related issues thus they are implemented in the software only.
The end users are closest to the application layer. End users and the application layer interact using application software.
The lower layer of the OSI model deals with data transportation issues. The physical and data link layer are implemented in the software and hardware. The physical layer is the lower layer in the OSI model and is directly in touch with the physical medium.
Where does the OSI model exist?
OSI model is a hypothetical model that actually does not resides inside the system rather it could be used and implemented in the computer network to establish communication between the computer devices over a network or the internet.
Check out the function of each layer in the OSI model…
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OSI MODEL: Open System Interconnection…
Using this blog post(OSI MODEL) we have gone through What is the purpose of the OSI model? What are the 7 network layers? What is the OSI model with an example? What are the 7 layers of security? What is the OSI model used for? Where does the OSI model exist? Where the OSI model is implemented? Which layer is the heart of the OSI model?
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