WIFI TECHNOLOGY

Contents
 Introduction
 Need of Wi-Fi Technology
 Purpose
 History
 Wi-Fi Technology
 How a Wi-Fi Network Works
 Topologies & Configurations
 Applications
 Wi-Fi Security
 Advantages & Limitations
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Introduction
Wireless 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.
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Wi-Fi Technology

Rat’s Nest Of Wires
5
Home!
!!

Purpose
 The purpose of Wi-Fi is to hide complexity by enabling
wireless access to applications and data, media and streams.
 The main aims of Wi-Fi are:
 make access to information easier
 ensure compatibility and co-existence of devices
 eliminate complex cabling
 eliminate switches, adapters, plugs, pins and connectors
7

Wi-Fi Alliance
 Wi-Fi technology builds on IEEE 802.11 standards. The IEEE
develops and publishes these standards, but does not test
equipment for compliance with them. The non-profit Wi-Fi
Alliance formed in 1999 to fill this void.
 The Wi-Fi Alliance, a global association of companies.
 As of 2009 the Wi-Fi Alliance consisted of more than 300
companies from around the world.
 Manufacturers with membership in the Wi-Fi Alliance, whose
products pass the certification process, gain the right to mark
those products with the Wi-Fi logo.
9

The Wi-Fi Technology
 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
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Which Standard is right for
me?11

Elements of a WI-FI Network
• 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 and relay
information. 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.
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AP-based topology
 The client communicate through Access Point.
 BSA-RF coverage provided by an AP.
 ESA-It consists of 2 or more BSA.
 ESA cell includes 10-15% overlap to allow roaming.
15

Peer-to-Peer topology
 AP is not required.
 Client devices within a cell can communicate directly with
each other.
 It is useful for setting up of a wireless network quickly and
easily.
16

Wi-Fi Configurations
 Wi-Fi is composed of three main sectors:
 Home (individual residences and apartment buildings)
 Public (Round about 70,000 “hotspots” through out the world)
 Enterprise (corporations, universities, office parks)
17

Radio Signal Interference
Radio and Infrared transmissions
susceptible to noise and
interference
19

Wi-Fi Security
 Service Set Identifier (SSID)
 Wired Equivalent Privacy (WEP)
 Wireless Protected Access (WPA)
 IEEE 802.11i
 WEP and WPA are encryption protocols that you can choose
from in your router's firmware.
 Wi-Fi Protected Access (WPA), a subset of the upcoming
802.11i security standard, will replace the flawed Wired
Equivalent Privacy (WEP).
 Without your SSID, people will not be able to join your Wi-Fi
hotspot.
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Advantages
 Mobility
 Ease of Installation
 Flexibility
 Cost
 Reliability
 Security
 Use unlicensed part of the radio spectrum
 Roaming
 Speed
24

Limitations
 Interference
 Degradation in performance
 High power consumption
 Limited range
25

References
26
 www.Wikipedia.com
 www.techgig.com
 www.techonline.com
 info-techgeek.blogspot.com

WIFI TECHNOLOGY

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