1. Wi-Fi Technology

2. Introduction
Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode.
Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE communications standard for Wireless Local Area Networks (WLANs).
Wi-Fi Network connect computers to each other, to the internet and to the wired network.

3. Elements of a Wi-Fi Network
Access Point (AP) - The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices simultaneously to the Internet.
Wi-Fi cards - They accept the wireless signal and relay information. They can be internal and external. (e.g. PCMCIA Card for Laptop and PCI Card for Desktop PC)
Safeguards - Firewalls and anti-virus software protect networks from uninvited users and keep information secure.

4. Components of Wi-Fi
Access point
Adapters

5. Components of Wi-Fi
Wi-Fi Antenna
Wi-Fi Bridge

6. Components of Wi-Fi External USB wireless NICs
PCI cards that accept wireless PC cards
External USB wireless NICs

7. Wi-Fi Communication
Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed. 7

8. How a Wi-Fi Network Works
Basic concept is same as Walkie talkies.
A Wi-Fi hotspot is created by installing an access point to an internet connection.
An access point acts as a base station.
When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly.
A single access point can support up to 30 users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors.
Many access points can be connected to each other via Ethernet cables to create a single large network.

9. Wi-Fi Applications Home Small Businesses Large Corporations & Campuses
Health Care
Wireless ISP (WISP)
Travellers

10. Advantages Mobility Ease of Installation Flexibility Cost Security
Use unlicensed part of the radio spectrum
Speed

11. Limitations Interference Degradation in performance
High power consumption
Limited range

12. Wi-Fi Security Techniques
Service Set Identifier (SSID)
Wired Equivalent Privacy (WEP)
Wireless Protected Access (WPA)