Open System Interconnection (OSI) is a reference model that specifies how information from one computer's software application passes through a physical media to another computer's software application. The OSI is made up of seven levels, each of which performs a different network function.
The OSI reference model's goal is to help technology suppliers and developers construct interoperable digital communications goods and software programmes by providing a clear framework that explains the capabilities of a networking or telecommunications system in use.
Physical Layer (Layer 1)
Data Link Layer (DLL) (Layer 2)
Network Layer (Layer 3)
Transport Layer (Layer 4)
Session Layer (Layer 5)
Presentation Layer (Layer 6)
Application Layer (Layer 7)
It clearly distinguishes between services, interfaces, and protocols. As a result, it is adaptable. Depending on the nature of the network, each layer's protocols can be easily modified. Both connection-oriented and connectionless services are supported.
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