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this is the true information on WI-Fi { wirelressa fedility }


By: hassansalmi37 (84 month(s) ago)

please could you send to me you're presentation about wifi?? i really need it this is my mail : hsn.salmi@gmail.com thanks a lot....

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Presented By ADITYA


TABLE OF CONTENTS Introduction Wi-Fi Technologies How Wi-Fi Works ? Applications of Wi-Fi Advantages/ Limitations of Wi-Fi Wi-Fi security Techniques Conclusion


INTRODUCTION Wi-Fi is the wireless way to handle networking. 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 802.11 communications standard for Wireless Local Area Networks (WLANs).

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Wi-Fi Network connect computers to each other, to the internet and to the wired network. Wi-Fi is a wireless technology that uses radio frequency to transmit data through the air. I n 1991 Wi-Fi was invented by NCR Corporation (later on Lucent & Agere Systems) in the Netherlands . The term Wi-Fi , first used commercially in August 1999, 802.11 technology has its origins in 1985 ruled by the US Federal Communications Commission.

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The first wireless products were under the name Wave LAN . In 1999, the Wi-Fi Alliance was formed as a trade association to hold the Wi-Fi trademark under which most products are sold. Many traditional college campuses in the United States provide at least partial wireless Wi-Fi Internet coverage. In the early 2000s, many cities around the world announced plans to construct city-wide Wi-Fi networks.

What is the difference between a wireless router and a wireless modem? :

What is the difference between a wireless router and a wireless modem? wireless modem provides a way to connect to the internet through an Internet Service Provider (ISP). In the "old days", if you wanted to connect to the internet , you had to have your computer connected to a modem that had access to a telephone line to dial in to your ISP for an internet connection. A wireless router is a way for you to share one internet connection , usually at a home or small office, with multiple computers. So if you have a DSL Connection or Cable Modem connection at your house, you can share this high-speed connection with multiple computers at your house or small business.


THE Wi-Fi TECHNOLOGY Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed : IEEE 802.11a IEEE 802.11b IEEE 802.11g IEEE 802.11n

IEEE 802.11a:

IEEE 802.11a Introduced in 2001 Operates at 5 GHz (less popular) 54 Mbps (theoretical speed) 15-20 Mbps (Actual speed) 50-75 feet range More expensive Not compatible with 802.11b

IEEE 802.11b:

IEEE 802.11b Appear in late 1999 Operates at 2.4GHz radio spectrum 11 Mbps (theoretical speed) - within 30 m Range 4-6 Mbps (actual speed) 100 -150 feet range Most popular, Least Expensive Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.

IEEE 802.11g:

IEEE 802.11g Introduced in 2003 Combine the feature of both standards (a,b) 100-150 feet range Faster 54 Mbps Speed 2.4 GHz radio frequencies Outdoor ranges are quoted up to 1000 feet, but again this depends upon the environment.

IEEE 802.11n:

IEEE 802.11n Introduced in 2003 Standard significantly improves speed and range. 100-150 feet range 140 Mbps Speed 54Mbps (actual speed) 2.4 GHz radio frequencies Outdoor ranges are quoted up to 2000 feet, but again this depends upon the environment.


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.

How Wi-Fi Works ?:

How Wi-Fi Works ?


Wi-Fi APPLICATIONS Home Small Businesses Large Corporations & Campuses Health Care Educational Institutions Travellers

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Wi-Fi cameras used in banks

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Wi-Fi Antenna

Wi-Fi Splitting Process:

Wi-Fi Splitting Process

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Wi-Fi Router Setup

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Wi-Fi Security Log Client List

(a) Wireless Lan Card(f.v) (b)Wireless Lan Card(b.v):

(a) Wireless L an Card( f.v ) (b)Wireless Lan Card( b.v ) (c) Wireless Modem & Router

Wi-Fi Security Techniques:

Wi-Fi Security Techniques Service Set Identifier (SSID) Wired Equivalent Privacy (WEP) 802.1X Access Control Wireless Protected Access (WPA)

Wi-Fi Guardian::

Wi-Fi Guardian:


Mobility Easy of Installation Good Flexibility Cost Security Use unlicensed part of the radio spectrum Roaming Speed is high. ADVANTAGES


LIMITATIONS Interference Degradation in performance High power consumption Limited range Wi-Fi pollution:- excessive number of hotspots in a area.


CONCLUSION The outlook of Wi-Fi broadband wireless internet is boundless Greater and longer connection ranges with faster transfer speeds Many Applications In the futures we would also see better securities measures in protecting personal and confidential data's being received and sent out.

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