OSI model

The 7 layers of the OSI model

The OSI model is a conceptual framework that is used to describe how a network functions. It identifies seven fundamental networking layers, from the physical hardware up to high-level software applications.

Each layer in the model handles a specific networking function. The standard helps administrators to visualize networks, isolate problems, and understand the use cases for new technologies.

LayerNameFunction
7ApplicationProvides services to user applications, such as web browsers, email clients, file transfer programs, etc. For example, HTTP/HTTPS, SMTP, FTP, and DNS.
6PresentationTranslates data into a format that can be understood by the application layer. Handles encryption, compression, and character encoding. For example, SSL, SCP, and NetBIOS.
5SessionEstablishes, maintains, and terminates sessions between nodes. Manages authentication and authorization. For example, RPC and NFS.
4TransportProvides reliable data transfer between nodes. Handles error detection, correction, and flow control. Uses protocols such as TCP and UDP.
3NetworkRoutes data packets across different networks. Handles addressing and routing. Uses protocols such as IP and ICMP.
2Data LinkCommunicates between nodes that are directly connected in the same network. Handles frame synchronization and error detection. Uses protocols such as Ethernet and WiFi.
1PhysicalTransfers data as a stream of bits over a physical medium, such as a cable or wireless signal. Handles electrical signals and bit encoding. For example, Bluetooth, USB, DSL, and GSM.

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Javier Ruiz Cloud and SaaS Expert

Javier Ruiz

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