OSI Reference Model

Understanding the mystical OSI Model explained in simple terms

 Understanding computer network technologyAs you begin your quest to learn computer networking one of the first tasks you have before you is a basic understanding of the OSI model.

For many folks understanding the OSI model is like trying to understand some mystical formula that controls the way computer networks operate.

As we help you to begin your journey to understanding computer networking We will tackle explaining the complex subject of the computer networking OSI model simple terms in hopes that you will gain an understanding of the reasons behind the definitions

You can find a lot of resources that define the components of the OSI model, but an understanding of the reasons behind the definitions will go a lot way to fully understanding this complex technology model.

The acronym and the organization behind it can get confusing. The formal name for the OSI model is the Open Systems Interconnection model. Open Systems refers to a cooperative effort to have development of hardware and software among many vendors that could be used together. The model is a product of the International Organization for Standardization (2) which is often abbreviated ISO.

The Data Link Layer of the OSI model

A network interface controller (NIC)The Data Link Layer is Layer 2 of the seven-layer OSI model of computer networking.  The Data Link layer deals with issues on a single segment of the network.

Layer two of the OSI model is one area where the difference between the theoretical OSI reference model and the implementation of TCP/IP with the competing Department of Defense (DoD) model. As we will discuss with the implementation of TCP/IP there is one lower layer called the network interface layer that encompasses Ethernet.

Physical Layer Topology in computer networking

Physical Layer Topology in computer networkingA network topology refers to the layout of the transmission medium and devices on a network. As a networking professional for many years I can honestly say about the only time network topology has come up is for certification testing. Here are some basic definitions.

Physical Topology:

Physical topology defines the cable's actual physical configuration (star, bus, mesh, ring, cellular, hybrid).


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