2.  Introduction  Components of Wi-Fi and its working  IEEE 802.11 Architecture  Advantages and Limitations

3. What Is WiFi? The Wi-Fi Alliance Interoperability Wi-Fi Technology

4.  The term Wi-Fi is often used as a synonym for wireless LAN(WLAN).  A wireless network uses radio waves, just like cell phones, televisions and radios do.radio wavescell phonestelevisions  Uses high frequency radio waves rather than wires to communicate between nodes.  Wi-Fi is a generic term that refers to the IEEE 802.11 standard.

5.  A global association of companies, promotes WLAN technology and certifies products if they conform to certain standards of interoperability.  Not every IEEE 802.11-compliant device is submitted for certification to the Wi-Fi Alliance, sometimes because of costs associated with the certification process.

6.  It means that products from different companies will work together, so users don't get locked into a single brand of Wi-Fi products.  Wi-Fi Alliance member companies can submit products for certification.  Wi-Fi CERTIFIED products will contain a logo identifying which features have been tested and that the product has met all the standards of the notation.

7. YearData TransferFrenqency IEEE 802.11 19972 Mbps2.4 GHz Unregulated IEEE 802.11b 199911 Mbps2.4 GHz Unregulated IEEE 802.11a 1999-200054 Mbps5GHz Regulated IEEE 802.11g 2002-200354 Mbps2.4 GHz

9.  Introduction  Components of Wi-Fi and its working  IEEE 802.11 Architecture  Advantages and Limitations

10. Access Point Hot Spot Wi-Fi cards Safe guards

11.  The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices simultaneously to the Internet. Access Point (AP)

13.  They accept the wireless signal. 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 Wi-Fi cards

14.  A Wi-Fi hotspot is created by installing an access point to an internet connection.  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 up to 300 feet.

15.  It’s a two-way radio communication.  A computer's wireless adapter translates data into a radio signal and transmits it using an antenna.  A wireless router receives the signal and decodes it. The router sends the information to the Internet using a physical, wired Ethernet connection.routerEthernet  The process also works in reverse….

16.  Introduction  Components of Wi-Fi and its working  IEEE 802.11 Architecture  Advantages and Limitations

17. BSS ESS Station Types

20.  IEEE 802.11 defines three types of stations based on their mobility in a wireless LAN  No transition mobility-Station is stationary or move only inside a BSS  BSS transition mobility-Station can move from one BSS to another but confined inside one ESS  ESS transition mobility-station can move from one ESS to another. How ever there is no guarantee that the communication is continuous during the move.

21.  Introduction  Components of Wi-Fi and its working  IEEE 802.11 Architecture  Advantages and Limitations

22.  Long-Term Cost Savings  Reduced Installation Time  Mobility  Scalability  Easy access to the Internet in public places

23.  Interference  Degradation in performance  High power consumption  Limited range

24. References www.howstuffworks.com www.wikipedia.com References www.howstuffworks.com www.wikipedia.com