Open Systems Interconnection Model

OSI, or the Open System Interconnection, is a method of visualizing seven different layers of a network and how that network transmits data. It’s a theoretical concept, but it allows professionals to more clearly explain what certain software or hardware does specifically within a network by identifying certain “layers.” Those layers each perform tasks within network transmissions. They move from the most client-facing to the baseline, starting with number seven.

OSI is also referred to as the OSI reference model or OSI model.

The seven layers of OSI

7. The application layer is the most client-facing layer of the system and manages the most visible communication and authentication in networking.

6. The presentation layer makes data understandable for the application layer and prepares it to be sent over the network.

5. The session layer manages sessions between clients and servers, initiating them and determining their duration.

4. The transport layer manages data packets as they are sent across a network and the correct amount of data so that the system is not overwhelmed.

3. The network layer properly directs data packet transmissions between routers and throughout the network.

2. The data link layer directs data between nodes within a network, passing bits between different points. It also manages the rate of transmission, and it tracks if bits malfunction.

1. The physical layer includes the computer, motherboard, routers, or any other hardware that host a network.

Alternate definitions

OSI also stands for the Open Source Initiative, a non-profit that verifies different open source services.

 

 

Vangie Beal
Vangie Beal
Vangie Beal is a freelance business and technology writer covering Internet technologies and online business since the late '90s.
Get the Free Newsletter
Subscribe to Daily Tech Insider for top news, trends & analysis
This email address is invalid.
Get the Free Newsletter
Subscribe to Daily Tech Insider for top news, trends & analysis
This email address is invalid.

Related Articles

Embedded Analytics

Embedded analytics brings self-service business intelligence to everyday application users.

HRIS

Human resources information system (HRIS) solutions help businesses manage multiple facets of their workforce operations. They provide a central platform for human resources professionals...

Complete List of Cybersecurity Acronyms

Cybersecurity news and best practices are full of acronyms and abbreviations. Without understanding what each one means, it's difficult to comprehend the significance of...

Human Resources Management System

A Human Resources Management System (HRMS) is a software application that supports many functions of a company's Human Resources department, including benefits administration, payroll,...

ScalaHosting

ScalaHosting is a leading managed hosting provider that offers secure, scalable, and affordable...

HRIS

Human resources information system (HRIS) solutions help businesses manage multiple facets of their...

Best Managed Service Providers...

In today's business world, managed services are more critical than ever. They can...