wifi himanshu

Made by :
Guided by :
Himanshu mahilang
12 a
Vimal sir

OUTLINES
• Introduction
• What is Wi-Fi ?
• Wi-Fi Standards
• Super wifi
• Hotspots
• Wi-Fi Network Elements
• Some device
• How a Wi-Fi Network Works
• Advantages and Limitations of Wi-Fi
• Wi-Fi Security
• Conclusion
• The Future of Wi-Fi

INTRODUCTION
 Imagine working on your laptop or checking e-mail
from anywhere in your home.
 Imagine being able to connect to your office
network from an airport or coffee shop.
 Now , imagine doing all these
things easily and quickly, without
worrying about finding a wired
network connection.
That is Wi-Fi !

WHAT
Wi-Fi (Wireless Fidelity) is a generic term that refers to
the IEEE 802.11 communications standard for Wireless
Local Area Networks (WLANs).
Wireless Technology is an alternative to Wired
Technology, which is commonly used, for connecting
devices in wireless using radio waves.
Allows you to access the Internet while on the move ;
you can remain online while moving from one area to
another, without a disconnection or loss in coverage.

IEEE 802.11 S
In 1997, the Institute of Electrical and Electronic Engineers
(IEEE) drafted the 802.11 standard for wireless local area
networking.
In 1999, networking hardware companies accepted the
standard and began manufacturing products using the
802.11b protocol which operated in the 2.4 GHz range
and was capable of transmitting at speeds of 11 Mbps.
The 802.11a protocol was also released in 1999,
operating at 5 GHz with transmissions speeds of 54 Mbps,
but its cost was high.

• IEEE 802.22, a standard for wireless regional area
networks (WRAN) in TV white space
• Super Wi-Fi is a term coined by the United States Federal
Communications Commission (FCC) to describe a wireless
networking proposal which the FCC plans to use for the creation
of longer-distance wireless Internet access.
• A trade show has also been called the "Super WiFi Summit" (without
hyphen).[3] Various standards such as IEEE 802.22 have been proposed
for this concept.Instead of using the 2.4 GHz radio frequency of Wi-Fi,
the "Super Wi-Fi" proposal uses the lower-frequency white spaces
between television channel frequencies.
Super wifi

HOTSPOT
A Hotspot is any location where Wi-Fi
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. All the locations
discussed below are examples of Hotspots.
What is a Hotspot ?
network access is made publicly available.

WI-FI HOTSPOT LOCATIONS
Airports
Hotels & Resorts
Restaurants
Coffee Shops
Bookstores
Shopping Malls
 There are several online services
allow you find hotspot locations.

ELEMENTS OF A WI-FI N
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.

PCI AND USB ADAPTERS
PCI adapter USB adapter PCMCIA adapter
(Internal) (External)
For Desktop For Laptop

An embedded RouterBoard 112 with U.FL-RSMA pigtail and R52 mini PCI
Wi-Fi card widely used by wireless Internet service providers (WISPs) in
the Czech Republic

OSBRiDGE 3GN – 802.11n Access Point and UMTS/GSM Gateway
in one deviceAn Atheros draft-N Wi-Fi adapter with built in Bluetooth
on a Sony Vaio E series laptopUSB wireless adapter

An Atheros draft-N Wi-Fi adapter with built
in Bluetooth on a Sony Vaio E series
laptopUSB wireless adapter

HOW A WI-FI NETWORK WOR
• A Wi-Fi connection works through a transmitting antenna, which is
usually connected to a DSL or cable Internet connection. The anten
on the router will then beam radio signals through a specific range.
Another antenna, which is on the laptop or personal computer, rece
the signal.

ADVANTAGES OF 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

LIMITATIONS OF 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 .

BASIC WI-FI SECURITY TECHNIQUES
WEP(Wired Equivalent Privacy) : The original encryption technique
IEEE 802.11 standard.
WPA(Wi-Fi Protected Access ): A new standard that provides impro
security over WEP.
WPA2 : is an improved version of WPA that uses Advanced Encrypt
(AES) technology.

BASIC WI-FI SECURITY
TECHNIQUES(CONT.)
Securing
Method
Encryption Type
Used
Security Level Notes
WEP RC4 encryption
algorithm
Low
No longer used; it is can be
hacked easily
WPA TKIP Protocol High
provides improved
encryption security over
WEP
WPA2 CCMP Protocol Very High
An improved version of
WPA that uses Advanced
Encryption Standard

CON
• Wi-Fi is a simple, cost-effective way to connect to the Inter
need to physically connecting wires.
• In 1997 IEEE drafted the 802.11 standard for wireless local are
• Hotspot is a geographic area setup in any public location, a
accessible wireless network.
• Security is a huge challenge for Wi-Fi Networks, many Sec
are used to improve it.
• Wi-Fi Networks have a several limitations that should be conc

THE FUTURE OF WI-FI• The future of Wi-Fi is very bright. Its growing in popularity becau
decreasing costs and the freedom it gives to users.
HotelsofferingWi-Fi

wifi himanshu

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