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Upeksha
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Why ISO-OSI model is considered as a reference model?
DEvens said:
Yes, it is.Routaran said:The OSI model these days is primarily an educational tool.
No I don't think so. TCP/IP is only part of the model, in particular from the network up to application layer.Originally, OSI was the base for a number of protocols that were used in networks but the rise of TCP/IP and the internet spelled the end for it.
Yes, but each layer act like a assembly machine in a factory where each packet is produced then framed then transferred etc. They don't simply "fit" together. Each has its own function to perform its solely designed task.However, the OSI model still provided an excellent means for explaining networking and how networks operate in general terms, how the layers fit in together, etc.
No, it's reference because its useable components are public. Each layer provides a public interface for the next one to use and be used.It's called a reference model for this reason, it's not actually how stuff works but it's close enough and a really good way to teach people the general principles involved in how current networking protocols work.
Silicon Waffle said:TCP/IP is only part of the model, in particular from the network up to application layer.
In the context of the OP's question, my meaning with "fit in" was how data is encapsulated. I intentionally left out specific details as it provides an opportunity for the OP to do a little research.Silicon Waffle said:Yes, but each layer act like a assembly machine in a factory where each packet is produced then framed then transferred etc. They don't simply "fit" together. Each has its own function to perform its solely designed task.
Technically, a reference model is a concept. A set of interconnected/interdependent ideas or functions that are defined by some accepted relevant body of experts with the goal of establishing or encouraging clear communication.Silicon Waffle said:No, it's reference because its useable components are public. Each layer provides a public interface for the next one to use and be used.
Cisco isn't suggesting nor has it reformed the OSI model, when they say 4 layers. They are simply making a reference to the TCP/IP model which contains only 4 layers.Silicon Waffle said:This model is standardized, reused and can certainly be reformed (i.e Cisco suggests only 4 layers instead of 7).
OK cool, I misunderstood about concepts of TCP/IP in programming and the model itself at that time.Routaran said:No. TCP/IP was never part of the OSI model. OSI had it's own network protocols like CLNP and CONP. TCP/IP and OSI were competing protocol suites.
OSI was an initiative started by the International Organization for Standardization (ISO) while TCP/IP was started by the US Department of Defence.
TCP/IP won out in the 90s after it was commercially adopted and became what we now call the internet. OSI all but disappeared.
http://spectrum.ieee.org/computing/networks/osi-the-internet-that-wasnt
http://www.ciscopress.com/articles/article.asp?p=1757634&seqNum=2...
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Yes, they apply the TCP/IP model and they never say anything about 7 layers while These two models are not totally different at all (one layer of one already encapsulates 2-3 layers of another).Cisco isn't suggesting nor has it reformed the OSI model, when they say 4 layers. They are simply making a reference to the TCP/IP model which contains only 4 layers.
The ISO-OSI (Open Systems Interconnection) model is a conceptual framework that describes how different communication systems can communicate with each other. It is considered a reference model because it provides a common structure for understanding and designing communication protocols. This allows for easier communication between different systems and ensures compatibility and interoperability.
The ISO-OSI model breaks down network communication into seven distinct layers, each with its own specific function and purpose. This modular approach helps to simplify the understanding of complex network systems by dividing them into smaller, more manageable parts.
One of the main benefits of using the ISO-OSI model for network design is that it provides a standardized framework that allows for easier communication between different systems. It also allows for easier troubleshooting and maintenance, as issues can be pinpointed to specific layers rather than the entire system.
Interoperability refers to the ability of different systems to communicate and exchange data with each other. The ISO-OSI model promotes interoperability by providing a common structure and set of protocols for communication. This ensures that different systems can communicate with each other, regardless of their underlying technologies.
Yes, the ISO-OSI model is a universal model that can be applied to all types of networks, from small local networks to large global networks. It provides a general framework that can be adapted and expanded upon to suit the specific needs of different types of networks.