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What is SNA Systems Network Architecture?
SNA stands for Systems Network Architecture and is a networking protocol originally developed by IBM in the 1970s. It was designed to allow different computers and terminals to communicate within a network.
This network architecture provided a framework for connecting various devices and systems, enabling reliable and secure data transmission. SNA played a pivotal role in the early days of mainframe computing and laid the foundation for the development of modern networking technologies.
Understanding the Basic Concepts
To grasp the essence of SNA, it’s important to understand the key concepts that underpin this network architecture:
1. Nodes: In SNA, a node represents any computing device, such as a mainframe, terminal, or printer, that participates in the network. Each node has a unique address, allowing it to communicate with others.
2. Logical Units (LUs): Logical Units are software entities within the nodes that facilitate communication between devices. Each LU within a node is assigned a specific address for identification.
3. Physical Units (PUs): Physical Units represent the hardware components that handle the physical transmission of data. This includes communication controllers and network interfaces.
4. Path Control: SNA incorporates path control mechanisms to determine the most efficient route for transmitting data between nodes. It ensures reliable and timely information exchange.
5. Session Layer: The session layer in SNA manages the establishment, maintenance, and termination of communication sessions between nodes. It provides features such as security and error recovery.
6. Logical Units of Work (LUWs): LUWs are the units of information that are transmitted between logical units. They may contain any data, such as commands, responses, or files.
SNA played a significant role in the development of computer networking, facilitating seamless communication between different devices in a distributed computing environment. While newer networking protocols have emerged, SNA’s legacy can still be found in some legacy systems today.
As technology continues to evolve, understanding the fundamentals of SNA Systems Network Architecture provides valuable insights into the evolution of modern networking concepts and protocols.
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