This document discusses Wi-Fi and wireless networks. It defines Wi-Fi as allowing devices to communicate over a wireless network using IEEE 802.11 standards. It describes the various Wi-Fi standards over time that have increased speeds up to 600Mbps. The document also discusses Wi-Fi hotspots as locations that provide public wireless access and lists common hotspot locations. It outlines the basic components of a Wi-Fi network including access points, firewalls, and Wi-Fi cards. The document covers advantages like mobility and ease of installation but also limitations such as limited range and security risks. It concludes that Wi-Fi provides a simple way to connect without wires but security remains a challenge.

1. Jay Kaushik
Nokia
6/17/2019
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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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10. WIFI
 Airports
 Hotels & Resorts
 Restaurants
 Coffee Shops
 Bookstores
 Shopping Malls
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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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17. Thank you
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