2. Introduction
What is Wi-Fi?
Wi-Fi standards
Hotspots
Wi-Fi hotspot location
Elements of Wi-Fi network
How a Wi-Fi Network Works
Advantages and Limitations of Wi-Fi
Wi-Fi Security
Conclusion
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3. WI-FI?
Wi-Fi is wireless fidelity
Wi-Fi allows computers and other devices to communicate over a wireless
network.
Wi-Fi network components are based on the one of the 802.11 standards developed
by the IEEE and adopted by Wi-Fi alliance.
You can use Wi-Fi to create a hotspot within the range of 20 meters (66 feet).
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4. In 1997, the Institute of Electrical and Electronic Engineers (IEEE) drafted the
802.11 standard for wireless local area networking.
Wi-Fi networks use radio technologies to transmit & receive data at high speed.
IEEE 802.11b
IEEE 802.11a
IEEE 802.11g
IEEE 802.11n
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5. Appear in 1999
Operates at 2.4ghz radio spectrum
11 mbps (theoretical speed) – within 30m range
4-6 Mbps (actual speed)
30-45m range
Most popular and least expensive
Interference from mobile and Bluetooth devices which can reduce the
transmission rate
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6. Introduced in 2001
Operates at 5Ghz (less popular)
54Mbps(theoretical speed)
15-20Mbps(Actual speed)
15-25m range
More expensive
Not compatible with 802.11b
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7. Introduced in 2003
Combine the feature of both(a,b)
30-40 m range
54 Mbps speed
2.4Ghz radio frequencies
Compatible with b
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8. Adding (MIMO)
Operates on both the 2.4Ghz and lesser used 5Ghz bands
Maximum net data rate from 54mbit/s to 600Mbit/s
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9. A Hotspot is any location where Wi-Fi network access is made publicly available.
Hotspots are equipped with a Broadband Internet connection, and one or more
Access Points that allow users to access the Internet wirelessly.
Hotspots can be setup in any public location that can support an Internet
connection.
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11. WI-FI
Access Point (AP) - The AP is a wireless LAN transceiver or “base station” that
can connect one or many wireless devices in the same time to the Internet
Safeguards - Firewalls and anti-virus software protect networks from uninvited
users and keep information secure
Wi-Fi cards (Adapters) - They accept the wireless signal and relay information.
They can be internal and external.
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12. WI-FI
A Wi-Fi connection works through a transmitting antenna, which is usually
connected to a DSL or cable Internet connection. The antenna on the router will
then beam radio signals through a specific range. Another antenna, which is on
the laptop or personal computer, receives the signal.
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13. ADVANTAGES WI-FI
No Wires - A truly wireless networking solution
No Waiting - Fast, easy deployments.
No Worries - A wireless networking system that is secure, easy to manage, and
built to grow with you.
Ease of Installation - Quick, easy setup
Fast data transfer rates
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14. WI-FI
Limited range
Data security risks :a huge challenge for Wi-Fi networks.
Interference from other devices : such as telephones, microwave ovens
High power consumption :making battery life and heat a concern .
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15. WI-FI
WEP(Wired Equivalent Privacy) : The original encryption technique specified by
the IEEE 802.11 standard.
WPA(Wi-Fi Protected Access ): A new standard that provides improved encryption
security over WEP.
WPA2 : is an improved version of WPA that uses Advanced Encryption Standard
(AES) technology.
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16. Wi-Fi is a simple, cost-effective way to connect to the Internet, without the need to
physically connecting wires
Hotspot is a geographic area setup in any public location, and has a readily
accessible wireless network.
Security is a huge challenge for Wi-Fi Networks, many Security Techniques are
used to improve it.
Wi-Fi Networks have a several limitations that should be concerned.
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