Wireless Networks Lecture 1: Introduction to Wireless Networks

Wireless Networks
Lecture 1: Introduction to Wireless Networks

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.

A wireless network enables people to communicate and access applications and information without wires.
• This provides freedom of movement and the ability to extend applications to different parts of a building, city, or nearly anywhere in the world.
•wireless networks use either radio waves or infrared light for communication between users, servers, and databases. This type of communication is invisible to the human eye. In addition, the actual medium (air) is transparent to the user.

General Wireless Topologies
•WPAN
•WLAN
•WMAN
•WWAN