Introduction
The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications
between any two networked systems. It divides the communications processes into seven layers. Each layer
both performs specific functions to support the layers above it and offers services to the layers below it.The
three lowest layers focus on passing traffic through the network to an end system.The top four layers come
into play in the end system to complete the process.
The main benefits of the OSI model include the following:
• Helps users understand the big picture of networking
• Helps users understand how hardware and software elements function together
• Makes troubleshooting easier by separating networks into manageable pieces
• Defines terms that networking professionals can use to compare basic functional relationships on differ-
ent networks
• Helps users understand new technologies as they are developed
• Aids in interpreting vendor explanations of product functionality
The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications
between any two networked systems. It divides the communications processes into seven layers. Each layer
both performs specific functions to support the layers above it and offers services to the layers below it.The
three lowest layers focus on passing traffic through the network to an end system.The top four layers come
into play in the end system to complete the process.
The main benefits of the OSI model include the following:
• Helps users understand the big picture of networking
• Helps users understand how hardware and software elements function together
• Makes troubleshooting easier by separating networks into manageable pieces
• Defines terms that networking professionals can use to compare basic functional relationships on differ-
ent networks
• Helps users understand new technologies as they are developed
• Aids in interpreting vendor explanations of product functionality
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