Hello friends, In this blog post(Difference between OSI and TCP-IP Model) I am going to let you know about the differences between OSI and TCP-IP Model – OSI vs TCP-IP.
Inside this blog post(Difference between OSI and TCP-IP Model), we will go through What is the difference between TCP and IP? Which is older TCP IP or OSI? What is the TCP IP model explain in detail? What are the advantages of the TCP IP model over the OSI model? What are the differences between the OSI and TCP IP models?
Since TCP/IP protocol was designed before the OSI model, therefore the layers in TCP-IP do not correspond exactly to the OSI layers. The application layer in TCP-IP is equivalent to the combined session, presentation, and application layers of the OSI model|Difference between OSI and TCP-IP Model|
This signifies that all the functionalities associated with those three layers are handled in one single layer, the application layer as shown in the below-given fig|Difference between OSI and TCP-IP Model|
In other words, every application program must include all tasks assigned to the session, presentation and application layer of the OSI Model. This has one advantage, each application program is independent.
It requires only those functions needed for the job for which the application is designed. One disadvantage is that the same tasks appear in different application programs, making them more complex.
This damages the whole concept of modularity and layered architecture of the OSI model.
The comparison of the OSI and TCP-IP Model is as follows:-
Similarities: OSI vs TCP-IP
Both are based on the concept of a stack of independent protocols.
The functionality of the layers is roughly similar.
For example, In both the models the layers up through and including the transport layer are there to provide and end to end network-independent transport service to processes wishing to communicate.
These layers form the transport provider. Again in both models, the layers above transport are application-oriented users of transport services.
Differences: OSI vs TCP-IP
The OSI model focuses on three concepts –
Each layer performs some services for the layers above it. The service definition tells what the layer does, not how the entities above it access it out how the layer works.
A layer’s interface tells the processes above it how to access it. It tells nothing about the layer’s internal working.
The peer protocols used in a layer carry out all the activities/transactions of the layer. They are internal to the layer and the layer can choose any among the set to carry its business and also change them at will.
The TCP-IP model did not originally clearly distinguish between services, interfaces, and protocols. Consequently, the protocols in the OSI model are better hidden than in the TCP-IP model and can be replaced relatively easily as the terminology changes.
The OSI reference model was devised before the protocols were invented. This ordering means that the model was not biased towards one particular set of protocols but the problem was that the designer did not have much experience with the subject and did not have a good idea of which functionality to put in which layer.
While in the TCP-IP model, the protocols came first, and the mode was really just a description of the existing protocols. There was no problem with the protocols fitting the model. The only trouble was that the model did not fit any other protocol stacks.
The two models also differ in the number of layers – the OSI model has seven-layer and the TCP-IP has four layers. Both have network, transport and application layers, but the other layers are different.
The OSI Model supports both connectionless and connection-oriented communication in the network layer, but only connection-oriented communication in the transport layer.
The TCP-IP model supports only connectionless communication in the network layer but supports both modes in the transport layer giving the users a choice.
See the quick revision:
What is the difference between TCP and IP?
The TCP protocol is responsible for sure delivery of a data packet whereas IP is used for logical addressing. Mean to say that IP found out the address and TCP takes the responsibility to deliver the packet with all safety.
Which is older TCP IP or OSI?
As we know the TCP/IP model is a real and practically implemented model on the internet and the OSI model is a hypothetical model of communication. TCP/IP model is older than the OSI model which came approx 10 years before the OSI model.
What is the TCP IP model explain in detail?
TCP/IP model stands for transmission control protocol and internet protocol. This is the real model that is being used in the current network architecture or over the internet. This model with the help of its protocol makes sure the delivery of data packets from source to destination or on the internet. And this protocol also supports the naming the addressing scheme.
What are the advantages of the TCP IP model over the OSI model?
Using this blog(Difference between OSI and TCP-IP Model) we have gone through What is the difference between TCP and IP? Which is older TCP IP or OSI? What is the TCP IP model explain in detail? What are the advantages of the TCP IP model over the OSI model? What are the differences between the OSI and TCP IP models?
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