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OSI 7 Layer 본문
The Open Systems Interconnection (OSI) model is a conceptual framework used to describe the communication functions of a network. It consists of seven layers, each of which represents a specific function in the communication process.
The seven layers of the OSI model, from bottom to top, are:
Physical Layer: Deals with the physical characteristics of the communication medium, such as voltage levels and transmission frequencies.
Data Link Layer: Responsible for transferring data between adjacent network nodes and for error detection and correction.
Network Layer: Provides routing and forwarding of data between different networks.
Transport Layer: Ensures reliable end-to-end transmission of data, including error detection and correction, flow control, and congestion avoidance.
Session Layer: Establishes, manages, and terminates communication sessions between applications running on different network nodes.
Presentation Layer: Handles the formatting and presentation of data, such as encryption and compression, to ensure that it is usable by applications.
Application Layer: Provides network services to end-users, such as email, file transfer, and remote login.
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