The highest layer of the OSI network protocol layer is the application layer. OSI divides the computer network architecture into seven layers, namely: 1. Physical layer; 2. Data link layer; 3. Network layer; 4. Transport layer; 5. Session layer; 6. Presentation layer; 7. Application layer .
The highest layer of the OSI network protocol layer is the application layer.
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Open system interconnection communication reference model, referred to as OSI model (OSI model), a conceptual model proposed by the International Organization for Standardization, an attempt to make various A standard framework for interconnecting computers around the world into a network.
The OSI/RM protocol was developed by ISO (International Organization for Standardization). It has three basic functions: providing developers with a necessary, common concept for development and improvement, and can be used to explain the connection of different systems. s frame.
OSI divides the computer network architecture (architecture) into the following seven layers:
Physical layer: Converts data into electronic signals that can be transmitted through physical media. Equivalent to Porters in the post office.
Data link layer: Determines how to access the network medium. This layer frames the data and handles flow control. This layer specifies the topology and provides hardware addressing, which is equivalent to the packing and unpacking workers in the post office.
Network layer: Rights-of-use data routing through large networks, equivalent to sorting workers in the post office.
Transport layer: Provides reliable end-to-end connections, equivalent to the letter delivery clerk running the post office in the company.
Session layer: Allows users to establish connections using simple and easy-to-remember names, which is equivalent to the secretary in the company who sends letters, writes envelopes, and opens envelopes.
Presentation layer: negotiates the data exchange format. It is equivalent to the assistant who briefs the boss and writes letters for the boss in the company.
Application layer: The interface between the user's application and the network.
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