wi fi technology
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ramkumar.j
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#1
16-01-2010, 09:06 AM


I need papers for wi fi technology. Can u help please?
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electronics seminars
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#2
17-01-2010, 10:34 AM

please read topicideashow-to-wifi-seminar and presentation-report where seminar and presentation report about WiFi added


enjoy...it
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
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#3
07-01-2011, 05:23 PM




.ppt   Wi-Fi Technology.ppt (Size: 1.88 MB / Downloads: 273)



Submitted By
Faisal



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.

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
IEEE 802.11b
Appear in late 1999
Operates at 2.4GHz radio spectrum
11 Mbps (theoretical speed) - within 30 m Range
4-6 Mbps (actual speed)
100 -150 feet range
Most popular, Least Expensive
Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.
IEEE 802.11a
Introduced in 2001
Operates at 5 GHz (less popular)
54 Mbps (theoretical speed)
15-20 Mbps (Actual speed)
50-75 feet range
More expensive
Not compatible with 802.11b

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.
Wi-Fi Network Topologies
AP-based topology (Infrastructure Mode)

Peer-to-peer topology (Ad-hoc Mode)

Point-to-multipoint bridge topology




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#4
20-01-2011, 12:54 PM




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

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.


For more



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seminar addict
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#5
03-02-2012, 12:19 PM

hi
you can refer these pages to know the details on Wi- Fi Technology

topicideashow-to-wi-fi-the-wireless-wings-full-report

topicideashow-to-wi-fi-full-report

topicideashow-to-wifi-seminar and presentation-report?page=2

topicideashow-to-wifi-seminar and presentation-report?page=3

topicideashow-to-wifi-seminar and presentation-report?page=4
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#6
29-02-2012, 06:06 PM

pls send me the wi-fi full documentation plss
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seminar paper
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#7
01-03-2012, 12:06 PM

hi
you can refer these pages to know the details on Wi- Fi Technology

topicideashow-to-wi-fi-the-wireless-wings-full-report

topicideashow-to-wi-fi-full-report

topicideashow-to-wifi-seminar and presentation-report?page=2

topicideashow-to-wifi-seminar and presentation-report?page=3

topicideashow-to-wifi-seminar and presentation-report?page=4
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seminar flower
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#8
06-09-2012, 11:29 AM

Wi-Fi


.pptx   Wi-Fi.pptx (Size: 6.03 MB / Downloads: 12)

Wi-Fi Alliance snapshot

• International trade association of 350+
computing, handset, consumer
electronics makers and service
providers
• Industry leader and collaboration forum,
innovating for 11 years to meet the
needs of a wide variety of users and
use environments
• Enabling worldwide Wi-Fi adoption and
inclusion in a wide array of devices
through testing, market building, and
regulatory programs
• Wi-Fi CERTIFIED™ products deliver
advanced technology, the best user
experience and the latest security
protections

Wi-Fi CERTIFIED Wi-Fi Direct is personal Wi-Fi
networking that goes anywhere


• Connects devices directly, with or without a Wi-Fi network or hotspot available
• Makes the connection to open a world of applications, including content sharing,
synch, printing, gaming and more
• Easy to use and secure
• Wide variety of devices
from many vendors
• Connects with almost
any Wi-Fi CERTIFIED
device
• Designed for portable
and stationary devices

How the technology behind Wi-Fi Direct works:
All Wi-Fi Direct devices include WPA2 security


• Active Agreement: Connecting Wi-Fi Direct-certified devices requires active
agreement: one device must request access, and device controlling the group
grants permission
• Partition helps ensure security:
– Enterprise environment (access to printer w/o network); home (let your kid’s hacker
friend connect directly for gaming rather than full access)
– When cross connected to a traditional network, Wi-Fi Direct groups operate in an
independent security domain
• All Wi-Fi Direct-certified devices support WPA2 security protections. Only
authorized devices are permitted to connect, and transmissions over the air are
encrypted using government-grade AES (Advanced Encryption Standard)

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seminar flower
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#9
20-09-2012, 04:37 PM

Wi-Fi Technology


.ppt   WIFI_MONI.ppt (Size: 770 KB / Downloads: 20)

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.

IEEE 802.11b

Appear in late 1999
Operates at 2.4GHz radio spectrum
11 Mbps (theoretical speed) - within 30 m Range
4-6 Mbps (actual speed)
100 -150 feet range
Most popular, Least Expensive
Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.

DSSS

Direct sequence signaling technique divides the 2.4 GHz band into 11 22-MHz channels. Adjacent channels overlap one another partially, with three of the 11 being completely non-overlapping. Data is sent across one of these 22 MHz channels without hopping to other channels.

Data Link Layer

The data link layer consists of two sublayers :
Logical Link Control (LLC)
Media Access Control (MAC).
802.11 uses the same 802.2 LLC and 48-bit addressing as other 802 LANs, allowing for very simple bridging from wireless to IEEE wired networks, but the MAC is unique to WLANs.

Media Access Control

Carrier Sense Medium Access with collision avoidance protocol (CSMA/CA)
Listen before talking
Avoid collision by explicit Acknowledgement (ACK)
Problem: additional overhead of ACK packets, so slow performance
Request to Send/Clear to Send (RTS/CTS) protocol
Solution for “hidden node” problem
Problem: Adds additional overhead by temporarily reserving the medium, so used for large size packets only retransmission would be expensive

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.

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project girl
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Posts: 10,114
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#10
05-11-2012, 06:11 PM

Wi-Fi Technology



.ppt   1Wi-Fi.ppt (Size: 362 KB / Downloads: 36)

Wi-Fi Technology

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.

IEEE 802.11b

Appear in late 1999
Operates at 2.4GHz radio spectrum
11 Mbps (theoretical speed) - within 30 m Range
4-6 Mbps (actual speed)
100 -150 feet range
Most popular, Least Expensive
Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.

802.11 Physical Layer

There are three sublayers in physical layer:
Direct Sequence Spread Spectrum (DSSS)
Frequency Hoping Spread Spectrum (FHSS)
Diffused Infrared (DFIR) - Wide angle

IEEE 802.11 Data Link Layer

The data link layer consists of two sublayers :
Logical Link Control (LLC)
Media Access Control (MAC).
802.11 uses the same 802.2 LLC and 48-bit addressing as other 802 LANs, allowing for very simple bridging from wireless to IEEE wired networks, but the MAC is unique to WLANs.

802.11 Media Access Control

Carrier Sense Medium Access with collision avoidance protocol (CSMA/CA)
Listen before talking
Avoid collision by explicit Acknowledgement (ACK)
Problem: additional overhead of ACK packets, so slow performance
Request to Send/Clear to Send (RTS/CTS) protocol
Solution for “hidden node” problem
Problem: Adds additional overhead by temporarily reserving the medium, so used for large size packets only retransmission would be expensive
Power Management
MAC supports power conservation to extend the battery life of portable devices
Power utilization modes
Continuous Aware Mode
Radio is always on and drawing power
Power Save Polling Mode
Radio is “dozing” with access point queuing any data for it
The client radio will wake up periodically in time to receive regular beacon signals from the access point.
The beacon includes information regarding which stations have traffic waiting for them
The client awake on beacon notification and receive its data

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.

Point-to-multipoint bridge topology

This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart.These conditions receive a clear line of sight between buildings. The line-of-sight range varies based on the type of wireless bridge and antenna used as well as the environmental conditions.

Eavesdropping

Easy to perform, almost impossible to detect
By default, everything is transmitted in clear text
Usernames, passwords, content ...
No security offered by the transmission medium
Different tools available on the internet
Network sniffers, protocol analysers . . .
Password collectors
With the right equipment, it’s possible to eavesdrop traffic from few kilometers away

Wired Equivalent Privacy (WEP)

Provide same level of security as by wired network
Original security solution offered by the IEEE 802.11 standard
Uses RC4 encryption with pre-shared keys and 24 bit initialization vectors (IV)
key schedule is generated by concatenating the shared secret key with a random generated 24-bit IV
32 bit ICV (Integrity check value)
No. of bits in keyschedule is equal to sum of length of the plaintext and ICV
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Posts: 8,857
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#11
12-11-2012, 11:29 AM

to get information about the topic "wi fi technology " full report ppt and related topic refer the link bellow

topicideashow-to-wi-fi-technology

topicideashow-to-wi-fi-or-wireless-fidelity-technology

topicideashow-to-wi-fi-technology?pid=124380#pid124380

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