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Wireless Fidelity. Presented By: Naila Habib Khan. Topics. Introduction Components of Wi-Fi and its working IEEE 802.11 Architecture Advantages and Limitations. Introduction. What Is WiFi ? The Wi-Fi Alliance Interoperability Wi-Fi Technology. What Is Wi-Fi?.
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Wireless Fidelity • Presented By: • NailaHabib Khan
Topics • Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations
Introduction • What Is WiFi? • The Wi-Fi Alliance • Interoperability • Wi-Fi Technology
What Is Wi-Fi? • 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. • 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.
The Wi-Fi Alliance • 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.
Interoperability • 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.
Topics • Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations
Components of Wifi • Access Point • Hot Spot • Wi-Fi cards • Safe guards
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. 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
How a Wi-Fi Network Works • 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.
Wi-Fi communication • 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. • The process also works in reverse….
Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations Topics
IEEE 802.11 Architecture • BSS • ESS • Station Types
Station/Node Types • 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.
Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations Topics
Advantages • Long-Term Cost Savings • Reduced Installation Time • Mobility • Scalability • Easy access to the Internet in public places
Limitations OR Disadvantages • Interference • Degradation in performance • High power consumption • Limited range
Thank You References www.howstuffworks.com www.wikipedia.com