cassiebeisheim / 1600final

Open Systems Interconnection (OSI) Model: The basics

By Cassie Beisheim

Hello and welcome to my OSI Model basics tutorial. The OSI Model is a crucial aspect to understanding computing systems and how they work. While we no longer actively use the model (we use the TCP/IP model), it is still helpful in understanding how to troubleshoot errors and for one's overall understanding of functionality.

This tutorial is targeted at any individuals with little to moderate understanding of the OSI model, such as students taking a 1000 level course such as this one in a major that requires knowledge of it.

There are seven layers within the OSI Model, and I will be providing some information regarding each layer on the following pages:

• Layer 1: Physical
• Layer 2: Data Link
• Layer 3: Network
• Layer 4: Transport
• Layer 5: Session
• Layer 6: Presentation
• Layer 7: Application