Ccocrick: Created page with "== Open Systems Interconnection (OSI) Model == The '''Open Systems Interconnection''' (OSI) model is a conceptual framework used to understand and standardize the functions of a telecommunication or computing system. It divides the communication process into seven distinct layers, each responsible for specific tasks and interactions in the process of transmitting data over a network. === Layers === The OSI model consists of seven layers, each with its own unique funct..."

2024-05-09T02:16:05Z

Created page with "== Open Systems Interconnection (OSI) Model == The '''Open Systems Interconnection''' (OSI) model is a conceptual framework used to understand and standardize the functions of a telecommunication or computing system. It divides the communication process into seven distinct layers, each responsible for specific tasks and interactions in the process of transmitting data over a network. === Layers === The OSI model consists of seven layers, each with its own unique funct..."

New page

== Open Systems Interconnection (OSI) Model ==

The '''Open Systems Interconnection''' (OSI) model is a conceptual framework used to understand and standardize the functions of a telecommunication or computing system. It divides the communication process into seven distinct layers, each responsible for specific tasks and interactions in the process of transmitting data over a network.

=== Layers ===

The OSI model consists of seven layers, each with its own unique functions:

# '''Physical Layer''': The lowest layer of the OSI model, responsible for transmitting raw data bits over a physical medium. It defines the electrical, mechanical, and procedural standards for establishing and maintaining physical connections.
# '''Data Link Layer''': This layer is responsible for providing error-free transmission of data frames between adjacent nodes over a shared medium. It handles framing, error detection, and flow control.
# '''Network Layer''': The network layer is responsible for routing packets between different networks, regardless of the physical transmission medium. It provides logical addressing, routing, and fragmentation/reassembly of data packets.
# '''Transport Layer''': This layer ensures reliable end-to-end communication between hosts. It handles segmentation, flow control, error recovery, and connection establishment/termination.
# '''Session Layer''': The session layer establishes, maintains, and terminates sessions between applications. It provides services such as session establishment, synchronization, and checkpointing.
# '''Presentation Layer''': This layer is responsible for data translation, encryption, and compression. It ensures that data sent by one application can be understood by another application, regardless of the underlying data formats.
# '''Application Layer''': The highest layer of the OSI model, responsible for providing network services directly to end-users and applications. It includes protocols for services such as email, file transfer, and remote access.

=== Advantages ===

* '''Standardization''': The OSI model provides a standardized framework for understanding and designing network architectures, facilitating interoperability between different vendors and technologies.
* '''Modularity''': The layered architecture of the OSI model allows for easy identification and isolation of network issues, simplifying troubleshooting and maintenance.
* '''Flexibility''': The modular design of the OSI model allows for the development of new protocols and technologies to be integrated into existing networks without requiring major changes to the underlying infrastructure.

=== Disadvantages ===

* '''Complexity''': The OSI model can be complex to understand and implement, particularly for beginners, due to its detailed layering and interactions between layers.
* '''Real-world Implementation Variations''': Real-world network architectures often deviate from the OSI model, leading to interoperability challenges and compatibility issues between different networking technologies.

== See Also ==
* [[TCP/IP|Transmission Control Protocol/Internet Protocol (TCP/IP)]]
* [[Network_Protocol|Network Protocol]]
* [[ISO/IEC_7498-1|ISO/IEC 7498-1 (OSI Basic Reference Model)]]

== References ==
* [https://www.iso.org/standard/20925.html ISO/IEC 7498-1:1994 - Information technology -- Open Systems Interconnection -- Basic Reference Model: The Basic Model]

[[Category:Frameworks]]

OSI Model - Revision history