Reference from Google Layer 1: Physical layer It makes the relationship between a device and a transmission medium, such as a copper cable or fiber optical cable.
The Need for Standards A. Because of Islands of Automation History of Networking lecture there was a need for computers from different manufacturers to communicate with each other.
If all networks were from the same vendor, used the same hardware, software and cabling systems there would be no need for this. In reality network software from one vendors network will not easily run on another vendors network. An Apple Macintosh will not simply plug and play into a Netware Network.
A need for rules 1. Rules called standards, give network software and hardware vendors a blueprint to follow when designing network communication devices and network software. This blueprint concept allows vendors to upgrade software and hardware without compromising interoperability with other vendors network hardware or software.
Two different house builders following the same blueprint will build the same house even though each person will not do it identically, the two homes will function similarily.
Because of the need for rules governing network communication, in the International Organization of Standardization ISO formed a subcommittee to develop data communication standards to promote vendor interoperability and universal accessibility. The members of this organization were composed of computer and communications industry representatives.
This model serves as a functional guideline for network communication tasks. The OSI reference model does not specify any particular protocol or communication standard to do the different tasks mentioned in the model.
Even though few protocols comply exactly with the OSI reference model, most loosely follow the model in concept. Types of Standards A. In the world of networking some protocols are standards and some are not.
There are essentially two types of standards.
Defacto meaning from the fact 1. Standards that become standards because many people adopt them and generally think they are a good idea.
Examples of Defacto standards a. Dejure meaning from the law 1. Standards that are agreed upon by international bodies. These standards are not laws but are adopted by governments and are expected to be followed when communications equipment or software is being used.Sep 03, · OSI MODEL (Open Systems Interconnection Model) Introduction.
Developed in by the International Standards Organization (ISO) It is a way of sub-dividing a communications system into smaller parts called layers.
Open Systems Interconnect Model (OSI) Introduction Welcome to the free Cybrary online course for the Cisco Certified Network Administration (CCNA) professional certification.
This introductory lesson will help you fully understand . OSI (Open Systems Interconnection) is a reference model for how applications communicate over a network.
A reference model is a conceptual framework for understanding relationships. May 20, · Open Systems Interconnect Model OSI Introduction. NASA Live - Earth From Space (HDVR) ♥ ISS LIVE FEED #AstronomyDay | Subscribe now! Introduction to OSI - Open Systems Interconnection.
I. The Need for Standards. A. Because of Islands of Automation (History of Networking lecture) there was a need for computers from different manufacturers to communicate with each other. The Open Systems Interconnect (OSI) model is a standard reference model for the communication between two end users.
Seven different layers make up the OSI model: physical, data link, network, transport, session, presentation, and application.