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Community Blog What Is OSI Layer？

What Is OSI Layer？

The OSI (Open Systems Interconnection) model is a conceptual framework used to standardize the communication process between different computer systems.

The OSI (Open Systems Interconnection) model is a conceptual framework used to standardize the communication process between different computer systems. It divides the communication process into seven layers, each responsible for a specific set of functions.

How many models of OSI layers are there ?

The seven layers of the OSI model are as follows:

  1. Physical Layer: This layer deals with the physical aspects of data transmission, such as the cables, connectors, and other hardware used to transmit data. An example of this layer is Ethernet cables.
  2. Data Link Layer: This layer is responsible for error-free transmission of data over a physical link. It includes protocols for error detection and correction. An example of this layer is the Point-to-Point Protocol (PPP) used for dial-up internet connections.
  3. Network Layer: This layer is responsible for routing data between different networks. It uses IP addresses to identify the source and destination of data. An example of this layer is the Internet Protocol (IP).
  4. Transport Layer: This layer provides end-to-end communication between two devices. It ensures reliable and efficient data transfer, and includes protocols such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).
  5. Session Layer: This layer manages the establishment, maintenance, and termination of sessions between devices. It includes protocols such as the Session Initiation Protocol (SIP) used in VoIP (Voice over IP) applications.
  6. Presentation Layer: This layer deals with the format and presentation of data. It includes encryption, compression, and conversion of data into the appropriate format for transmission. An example of this layer is the Secure Sockets Layer (SSL) used for secure online transactions.
  7. Application Layer: This layer is responsible for the interaction between the user and the application. It includes protocols such as HTTP (Hypertext Transfer Protocol) used for web browsing.

Each layer of the OSI model performs a specific set of functions, and communication between devices can only occur when each layer is compatible with the corresponding layer on the other device. The OSI model is a useful tool for understanding the complex process of data communication and for developing new communication protocols.

Networking OSI Layer
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Dikky Ryan Pratama

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