in this presentation i just tried to tell detail information about wifi and wimax

1. Wi-Fi Technology
Presented by:-
Akhil. M.V.

2. Agenda
• Introduction
• Wi-Fi Technologies
• Wi-Fi Architecture
• Wi-Fi Network Elements
• How a Wi-Fi Network Works
• Wi-Fi Network Topologies
• Wi-Fi Configurations
• Applications of Wi-Fi
• Wi-Fi Security
• Advantages/ Disadvantages of Wi-Fi

3. Introduction
• 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).
• Wi-Fi Network connect computers to each other,
to the internet and to the wired network.

4. The Wi-Fi Technology
Wi-Fi Networks use Radio Technologies to
transmit & receive data at high speed:
◦ IEEE 802.11b
◦ IEEE 802.11a
◦ IEEE 802.11g

5. IEEE 802.11b
•Appear in late 1999
•Operates at 2.4GHZ radio spectrum
•11Mbps(theoretical speed) within 30m
range
•4-6Mbps(actual speed)
•100-150 feet range
•Most popular, least expensive

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

7. •It is extension of 802.11b,and shorter range
than 802.11b
•54Mbps(theoretical speed)
•20-25Mbps(actual speed)
•50-75feeet range
•More expensive
IEEE 802.11g

8. Elements of a WI-FI Network
• Access Point (AP)
• Wi-Fi cards
• Safeguards

9. 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.

10. Wi-Fi Network Topologies
• AP-based topology
• Peer-to-peer topology
• Point-to-multipoint bridge topology

11. Wi-Fi Configurations

12. What are Hotspots?
 Wireless hotspots are essentially
wireless access points providing network to
mobile, laptop or Smartphone, typically
in public locations.
 To put it more simply, they're places where you
can wirelessly connect to the Internet.
 some devices and Smartphone's also act
as mobile wi-fi hotspots

13. What is Wimax?
 WiMAX (Worldwide Interoperability for
Microwave Access) is
a wireless communications standard
designed to provide 30 to 40 megabit-
per-second data rates, with the 2011
update providing up to 1 Gbit/s for
fixed stations.

14. Difference B/w Wi-Fi and
Wimax
IEEE Standards:
 Wi-Fi is based on IEEE 802.11 standard where as
WiMAX is based on IEEE 802.16. However, both are
IEEE standards.
Range:
 Wi-Fi typically provides local network access for
around a few hundred feet with speeds of up to 54
Mbps, a single WiMAX antenna is expected to have a
range of up to 40 miles with speeds of 70 Mbps or
more. As such, WiMAX can bring the underlying
Internet connection needed to service local Wi-Fi
networks.

15. Difference B/w Wi-fi and
Wimax
Scalability:
 Wi-Fi is intended for LAN applications, users scale
from one to tens with one subscriber for each CPE
device. Fixed channel sizes (20MHz).
WiMAX is designed to efficiently support from one to
hundreds of Consumer premises equipments
(CPE)s, with unlimited subscribers behind each CPE.
Flexible channel sizes from 1.5MHz to 20MHz.
Bit rate:
 Wi-Fi works at 2.7 bps/Hz and can peak up to 54
Mbps in 20 MHz channel.
 WiMAX works at 5 bps/Hz and can peak up to 100
Mbps in a 20 MHz channel.

16. Difference B/w Wi-fi and
Wimax
Quality of Service:
 Wi-Fi does not guarantee any QoS but WiMax will provide your
several level of QoS.
 As such, WiMAX can bring the underlying Internet connection
needed to service local Wi-Fi networks. Wi-Fi does not provide
ubiquitous broadband while WiMAX does.

17. Wi-Fi Applications
• Home
• Small Businesses
• Large Corporations & Campuses
• Health Care
• Wireless ISP (WISP)
• Travellers

18. • Wireless technology doesn’t remove
any old security issues, but introduces
new ones
◦ Eavesdropping
◦ Man-in-the-middle attacks
◦ Denial of Service
Wi-Fi Security Threats

19. Wi-Fi Security Techniques
◦ Service Set Identifier (SSID)
◦ Wired Equivalent Privacy (WEP)
◦ 802.1X Access Control
◦ Wireless Protected Access (WPA)
◦ IEEE 802.11i

20. Advantages
• Mobility
• Ease of Installation
• Flexibility
• Cost
• Reliability
• Security
• Use unlicensed part of the radio spectrum
• Roaming
• Speed

21. Disadvantages
 Speed – Slower than cable
 Range – Affected by various medium
 Travels best through open space
 Reduced by walls, glass, water, etc

22. Conclusion
 Wi-Fi is one of the fastest growing
technologies. The Demand for connecting
devices without the use of cables is
increasing everywhere. Wi-fi can be found
on colleges campus, offices,& in many
public areas.

23. Any Queries ?????