OSI Reference Model

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).

The Physical Layer of the OSI model

Physical media is thought of as some sort of wireThe Physical Layer consists of the basic hardware transmission technologies of a network sometime referred to as the physical media. Physical media provides the electro-mechanical interface through which data moves among devices on the network.

Initially physical media is thought of as some sort of wire. As technology progresses the types of media grows.

Bounded media transmits signals by sending electricity or light over a cable. Unbounded media transmits data without the benefit of a conduit-it might transmit data through open air, water, or even a vacuum. Simply put, media is the wire, or anything that takes the place of the wire, such as fiber optic, infrared, or radio spectrum technology.

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