The difference between TCP/IP and ISO models

A protocol is therefore a set of rules that define how different systems communicate with each other. The difference between the OSI model and TCP/IP is the subject of this article.

In the case of computer networks, protocols define how data is transferred from one system to another. In this article, I will explain the difference between the TCP/IP and ISO models.

The ISO model

The OSI (Open Systems Interconnection) model is a standard for networked communication between all computer systems. It is a model of communication between computers proposed by the ISO (International Organization for Standardization) which describes the functions necessary for communication and the organization of these functions.

This model proposes a communication system composed of 7 different layers. The 7 layers defined by the OSI model are represented as follows:

7ApplicationDataAccess point to network services
6PresentationDataManages the encryption and decryption of data, converts machine data into data that can be used by any other machine
5SessionDataInter-host communication, manages sessions between different applications
4TransportSegmentEnd-to-end connection, connectability and flow control; port concept (TCP and UDP)
3NetworkPackageDetermines the data path and logical addressing (IP address)
2Data linkageFramePhysical addressing (MAC address)
1PhysicsBitTransmission of signals in digital or analog form
Difference between the OSI model and TCP/IP
Difference between the OSI model and TCP/IP

TCP/IP model

The TCP/IP suite, also known as the Internet protocol suite, is the set of protocols used to transfer data over the Internet. It is also often referred to as TCP/IP, after its first two protocols: TCP (Transmission Control Protocol) and IP (Internet Protocol).

The TCP/IP model is a realistic or practical approach to a network model where the OSI model is an idealized or theoretical model. Consequently, the TCP/IP model is used as the reference network model for the Internet.

This model proposes a communication system composed of 4 different layers. The 4 layers defined by the TCP/IP model are represented as follows:

4ApplicationDataIt is the communication layer that interfaces with the users, runs on the terminal host machines
3TransportSegmentIt is responsible for the dialogue between the terminal hosts of a communication, applications will use TCP for reliable transport and UDP without this service.
2InternetPackageIt allows to determine the best paths through the networks, globally identifies the interfaces, the routers transfer the IP traffic which is not intended for them
1Network accessFrame, bitIt organizes the bitstream, physically identifies the interfaces, sets the media access method and places the bitstream on the physical media, switches, cables, NICs

Difference between TCP/IP and ISO models

Difference between the OSI model and TCP/IP
Difference between the OSI model and TCP/IP
TCP/IP modelISO model
Transmission Control Protocol/ Internet ProtocolOpen System Interconnect
4 layers7 layers
It is a server/client model used for data transmission over the Internet.It is a theoretical model that is used for the computer system.
Mainly usedIn theory

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