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2025-04-07 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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The concept of OSI
The Open System Interconnect Open Systems Interconnection reference model is defined by ISO (International Organization for Standardization). It is a flexible, robust and interoperable model.
The purpose of OSI model
standardizes the interconnection standards of different systems, making it easier for two different systems to communicate without changing the underlying hardware or software logic.
OSI seven-layer model
from bottom to top are: physical layer, data link layer, network layer, transport layer, session layer, presentation layer, application layer.
OSI layer 7 function
Application layer
provides an interface for software, so that applications can use network services.
Presentation layer
Decoding and encoding, encryption and decryption, compression and decompression of data.
Session layer
establishes, manages, and terminates session connections between entities.
Transport layer
Segment and reorganize data to provide end-to-end data services (reliable or unreliable: TCP, UDP)
Network layer
transmits packets from source to destination, logical addressing and routing.
Data link layer
encapsulates the packet data into frames to realize the communication between two adjacent nodes and error detection.
Physical layer
transmits bits over the medium, providing mechanical and electrical protocols.
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