Planning - Lecture 1:Network Fundamentals Review

Planning for Information Network
Lecture 1:Network Fundamentals Review

Network Fundamentals - Introduction
•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.
•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.

Network Fundamentals - OSI Model
•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.