This document provides an overview of Wi-Fi technology. It discusses Wi-Fi standards such as 802.11b, 802.11a, and 802.11g. It describes Wi-Fi network elements including access points and Wi-Fi cards. It explains how Wi-Fi networks work and common topologies. It also covers Wi-Fi configurations, applications, security aspects, and advantages/disadvantages. The document presents Wi-Fi as a wireless alternative to wired networks that allows devices to connect without cables using radio technologies.

1. Presented by:-
Nishant Sinha
Branch: Information Technology

2. • 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. • 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. Wi-Fi Networks use Radio Technologies to
transmit & receive data at high speed:
• IEEE 802.11b
• IEEE 802.11a
• IEEE 802.11g

5. •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. •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

8. • 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.

9. • 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. • AP-based topology
• Peer-to-peer topology
• Point-to-multipoint bridge topology

12. • Home
• Small Businesses
• Large Corporations & Campuses
• Health Care
• Wireless ISP (WISP)
• Travellers

13. • Wireless technology doesn’t remove any
old security issues, but introduces new
ones
• Eavesdropping
• Man-in-the-middle attacks
• Denial of Service

14. • Service Set Identifier (SSID)
• Wired Equivalent Privacy (WEP)
• 802.1X Access Control
• Wireless Protected Access (WPA)
• IEEE 802.11i

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

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

17.  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.

18.  THANKYOU