wi-fi ppt presentation made my Mubeen Momin an awesome ppt

1. (CO-5G)
By
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2.  What is wi-fi?
 Introduction
 The wi-fi technology
 Naming secreat
 Brief history
 How a wifi network works
 Devices and components
 General applications set forth by the Wi-Fi Alliance
 Advantages and Disadvantages
 Basic sequrity stratigies
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3. What is Wi-Fi
?Short for wireless fidelity.
It is a wireless technology that uses radio
frequency to transmit data through the air.
Wi-Fi is based on the 802.11 standard:
802.11a
802.11b
802.11g
WI-FI TECHNOLOGY
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4. Introductio
nWireless Technology is an alternative to Wired
Technology, which is commonly used, for connecting
devices in wireless mode.
Wi-Fi is a generic term that refers to the IEEE 802.11
communications standard for Wireless Local Area
Networks (WLANs).
Wi-Fi Network connect computers to each other, to the
internet and to the wired network.
Wi-Fi works on physical and data link layer.
WI-FI TECHNOLOGY 4

5.  The technology used in Wi-Fi is easiest to understand in terms of
radio. It is quite similar to walkie-talkies, the only difference being in
the strength of signals.
 An ordinary walkie-talkie can handle only limited data in the range of
1000 bps, and operate at 49 MHz. In the case of Wi-Fi radios, the
signal strength is much more, so they can handle much higher data
rates.
 There are three versions of Wi-Fi radios currently available- the ones
that work with,
 802.11b
 802.11a
 802.11g 5
WI-FI TECHNOLOGY

6. NAMING SECRET
 The term Wi-Fi suggests Wireless Fidelity, resembling the
long-established audio-equipment classification term high
fidelity (in use since the 1930s ) or Hi-Fi (used since 1950).
 Phil Belanger who is the founding member of the Wi-Fi
Alliance states that term Wi-Fi was never supposed to mean
anything at all.
 The “yin-yang” logo indicates the certification of a product
for interoperability.
6WI-FI TECHNOLOGY

7. • IEEE (Institute of Electrical and Electronics Engineers)
established the 802.11 Group in 1990. Specifications for
standard ratified in 1997.
• Initial speeds were 1 and 2 Mbps.
• IEEE modified the standard in 1999 to include:
• 802.11b
• 802.11a
• 802.11g was added in 2003.
• IEEE Created standard, but Wi-Fi Alliance certifies products
WI-FI TECHNOLOGY 7

8. HOW A WI-FI NETWORK
WORKS
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WI-FI TECHNOLOGY

9. 9PCI adapter (inside) USB adapter (outside)
PCMCIA Card
(Portables)
WI-FI TECHNOLOGY

10. APPLICATIONS AND TARGET MARKETS TRANSMISSION CHARACTERISTICS
Application Examples Type Rate Duration/
volume
Audio/Video 1 HDTV and DV viewing for
commercial & domestics use
Constant
(low jitter)
27 Mbps Hours
Audio/Video 2 SDTV viewing for commercial and
domestic use
Constant
(low jitter)
6 Mbps Hours
Audio/Video 3 Video conferencing with VoIP Constant
(low jitter)
2 Mbps < 1 hr
Interactive 1 Interactive gaming, Internet
Browsing, Email
Variable 2 Mbps 1 hr
Interactive 2 VoIP, Internet gaming Constant
with
intervals
.2 MB/s 1 min – 1
hr
Bulk transfer Flash downloads file transfer,
media transfer
Variable 30 Mbps 10 MB – 10
GB
General applications set forth by the Wi-Fi Alliance
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11. ADVANTAGES DISADVANTAGES
1) Freedom – You can work
from any location that
you can get a signal.
Speed – Slower than cable.
2) Setup Cost – No cabling
required.
Range – Affected by various medium.
3) Flexibility – Quick and easy to
setup in temp or permanent
space.
Travels best through open space.
Reduced by walls, glass, water, etc.
4) Scaleable – Can be
expanded with growth.
Security – Greater exposure to
risks.
5) Mobile Access – Can
access the network on
the move.
Unauthorized access.
Compromising data.
Denial of service.

12. BASIC SECURITY
STRATEGIES
WI-FI TECHNOLOGY 12

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14. THANK
YOUWI-FI TECHNOLOGY14