Why do we use the 7 layers of OSI MODEL?

Answer 1

During the early years of our modern computer era, very few standards and protocols existed between various manufacturers. However, as time went on and computer technology continued to improve and become more widespread, it became apparent that standards would be necessary to ensure compatibility. This was especially true with regard to networks, and networking technology. Since the main purpose of a network is to share information, a standard that governs how this information is formatted, transmitted, received and verified would make it possible for information to be shared openly, even when dealing with dissimilar networks. This need for a standard means of implementing open communications led the ISO and ANSI to develop the seven-layer network communications model known as Open Systems Interconnect. By providing guidelines regarding the way network equipment should be manufactured and how network operating systems communicate on a network, the OSI model became the common link that allows data to be transmitted and exchanged reliably. Although it does not actually perform any functions or do any of the actual work, the OSI model defines the way things should be done by the software and hardware on a network so that communications can take place between two computers or nodes. In this way, the OSI model provides a universal set of rules that make it possible for various manufacturers and developers to create software and hardware that is compatible with each other. This makes for organized communications. As I thought about this, I related it to the freeways that connect the various states of the mainland U.S. Because all of these freeways were constructed with the same set of standards regarding the width of each lane, the proper side that a person should drive on, the speed at which they should travel, and so on, people can comfortably drive across the country in an organized and efficient manner and car manufacturers are able to design cars within these guidelines as well. On the other hand, if each state had devised its own set of rules, each differing from the other, not only would there be a lot more chaos on the roads, but also car manufacturers would have a hard time designing vehicles that would be compatible with each state's roads. To me, this illustrates the importance of the OSI model with respect to network communications. Not only is it the foundation for all network communications today, but also because it is such a fundamental part of these communications, it becomes very apparent to me that it is very important for a network technician to understand the OSI model in full detail. The OSI model is made up of the following layers: the physical, data link, network, transport, session, presentation and application. Together, these seven layers are collectively referred to as a stack. As a node receives data, each layer starting with the physical layer extracts the various portions of the packet and this process works its way up to the application layer. When data is sent, it begins at the application layer and travels down to the physical layer. The information is pushed to the next layer of the stack by means of commands called primitives. Each layer uses a peer protocol to encode the information, which ensures that the same layer on the receiving node will be able to understand the information.

Answer 2

OSI, formally know as the ISO OSI model, is standard model for network communication. The ISO formed the OSI or Open Systems Interconnection so that different systems can connect and communicate with one another over a network without system specific configuration(hence the word 'Open') The framework consists of 7 layers :-

• Application layer
• Presentation layer
• Sessions layer
• Transport layer
• Network layer
• Data link layer
• Physical layer

Physical layer is the lowermost layer that interacts directly with the communication media, wires. Application layer is the topmost layer with which the user interacts. Each layer has a very specific function related to it. They work on top of one another, meaning every layer offers service to the layer on top of it. Every data has to pass through all the layers and other information (address, error correction and detection bits, numbering,...) is added to the original data in the form of header and footers.

The OSI model is the standard model for everything in the world to connect to a network and communicate. Thus, it is implicitly present in all devices that connect to a network (including the internet) To enable communication between devices without any errors or problems, one has to follow this model. It is Open and universal.

Answer 3

The OSI is important because it provides a structured method for organizing and identifying processes and their respective layers. By having a method of organization such as the structure found with the OSI Model, a uniform way to recognize characteristics and variables for layers for computing is available. The OSI Model encompasses seven layers, which are as follows: Application; Presentation; Session; Transport; Network; Data Link; Physical.

Answer 4

The OSI model is the foundation of the Networking. For example, without a foundation a house can't exist, therefore, you have to build up foundation first and than you can expand upon your building.

Finally, it breaks down into 7 layers and what each does and what functionalities.

Amad. Syed r

From New York, Queens

Answer 5

The OSI model is a theoretical model of how protocols and standards should work together for a common understanding of network communications. It describes what happens when one packet goes from one device to another. Without the model we would not have an understanding of how to connect networks together.

A network engineer needs a very good understanding of the model and the responsibilities of each layer of the model.

Answer 6

By separating sales communications and multi-level marketing into smaller logical sections, the OSI model simplifies how networking protocols are created. The OSI model was designed to ensure different types of equipment (like adapters, routers, hubs and network adaptors) are compatible.

1. Provide a wide variety of choice

Customers have a wide variety of choice since software/ hardware from different manufactures work together in harmony. In addition, the OSI model can fit to any compatible software/hardware from different users in other parts of the world.

2. It does not rely on a specific operating system

OSI is convenient since errors are dealt with at each level, as different levels operate automatically independent of each other. This makes it easier to troubleshoot problems that may arise at each stage, by separating the networks into small manageable pieces.

3. The user can understand the common terms used in networking

OSI model also help the user to understand different networking terms and functional relationship applied on multiple networks. In addition, the user also understand how new technologies are developed in the existing networks.

4. Interprets product functionality at each stage

The OSI model simply uses different stages of functionality. For instance, each stage has specific functions to ensure all networks operate without technical hitches. Also, each layer has it own interface specifications and a well-defined connector.

5. Encrypt data for security purposes

Decryption and encryption services are also available for security purposes. Expansion and compression of messages is simplified to ensure it travels from one system to another efficiently.

6. It is easier to add multiple network models

The OSI model is designed in such a way that user further extend new protocols within the process. This means you can use additional layered architecture other than the existing one.

Due to its complexity, poor performance can be obtained in day to day applications, thereby it requires great technical know-how.

Answer 7

the importance of the OSi model is pi*13223=79851351613516.165816846846161

Answer 8

OSI model is used for the design of network allowing communication between different systems.