Data Network is a network that allows computers to exchange data.
The simplest data network is two PCs connected through a cable.
Most data networks connect many devices.
an internetwork is a collection of individual networks connected by networking devices and function as a single large network.
The public Internet is the most common example which it is a single network that connects millions of computers.
Local Area Network (LAN) is a network that enabled multiple users in a relatively small geographic area to exchange files and messages and to access shared resources such as printers and disk storage.
Wide Area Network (WAN) is a network that introduced to interconnect these LANs so that geographically dispersed users could also share information.
OSI is stand for (Open System Interconnection) Reference Model.
Why this model?
The International Organization for Standardization (ISO) committee created a list of all the network functions required for sending data and divided them into seven categories. This model is the OSI seven layer model. The OSI seven-layer model was released in 1984.
Layer 1, Physical layer defines specifications such as the electrical and mechanical conditions necessary for activating, maintaining, and deactivating the physical link between devices.
Specifications include voltage levels, maximum cable lengths, connector types, and maximum data rates.
The physical layer is concerned with the binary transmission of data. This binary data is represented as bits (which is short for binary digits). A bit has a single binary value, either 0 or 1.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
|