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BLUETOOTH AND Wi-Fi

PRESENTED BY:

DHIRAJ BARANWAL

BUDHADITYA CHATTERJEE

GAURAV JINDAL


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Bluetooth Technology

Bluetooth is an industrialspecification for wirelesspersonal area networks(PANs), also known as IEEE

802.15.1. Bluetooth provides a way to

connect and exchangeinformation betweendevices such as mobilephones, laptops, PCs,printers, digital cameras andvideo game consoles via asecure, globally unlicensedshort-range radio frequency.


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Bluetooth Contd.

Bluetooth is a radio standard and communications protocol.

It is primarily designed for low power consumption, with a

short range (1 meter, 10 meters, 100 meters).

The devices use a radio communications system, so they do

not have to be in line of sight of each other, and can even be

in other rooms, so long as the received transmission is

powerful enough.


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How it all started

The Bluetooth specification was first developed in

1994 by Jaap Haartsen, who was working for Ericsson

Radio Systems.

The specifications were formalized by the Bluetooth

Special Interest Group (SIG). The SIG was formally

announced on May 20, 1998.

It was established by Ericsson, Sony Ericsson, IBM,Intel, Toshiba and Nokia.

Today it has over 1800 companies worldwide.


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Bluetooth Applications

Between a cell phone and a hands free headset or car kit.

Wireless networking between PCs.

Wireless communications with PC input and output

devices.

Transfer of files between devices.

Wireless control of a games console, Nintendo's Wii and

Sony's PlayStation 3 will both use Bluetooth technology

for their wireless controllers.


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Introduction to Wi-Fi

Wireless Technology is an alternative to WiredTechnology, which is commonly used, for connectingdevices in wireless mode.

Wi-Fi (Wireless Fidelity) is a generic term that refersto the IEEE 802.11 communications standard forWireless Local Area Networks (WLANs).

Wi-Fi Network connect computers to each other, tothe internet and to the wired network.


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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


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802.11 Physical Layer

There are three sub layers in physical layer:

Direct Sequence Spread Spectrum (DSSS)

Frequency Hoping Spread Spectrum (FHSS)

Diffused Infrared (DFIR) - Wide angle


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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 channelswithout hopping to other channels.


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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-bitaddressing as other 802 LANs, allowing for very

simple bridging from wireless to IEEE wired

networks, but the MAC is unique to WLANs.


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Elements of a WI-FI Network

Access Point (AP) - The AP is a wireless LANtransceiver or base station that can connect one or many

wireless devices simultaneously to the Internet.

Wi-Fi cards - They accept the wireless signal and relayinformation.They can be internal and external.(e.g PCMCIA

Card for Laptop and PCI Card for Desktop PC)

Safeguards - Firewalls and anti-virus software protectnetworks from uninvited users and keep information secure.


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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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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.


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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 wirelessnetwork quickly and

easily.


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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 bridgeand antenna used as well as the environmental conditions.


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Wi-Fi Configurations


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Wi-Fi Configurations


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Wi-Fi Applications

Home

Small Businesses or SOHO

Large Corporations & Campuses Health Care

Wireless ISP (WISP)

Travellers


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Wi-Fi Security Threats

Wireless technology doesnt remove any old

security issues, but introduces new ones

Eavesdropping

Man-in-the-middle attacks

Denial of Service


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Wi-Fi Security

The requirements for Wi-Fi network security

can be broken down into two primary

components:

Authentication

User Authentication

Server Authentication

Privacy


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Wi-Fi Security Techniques

Service Set Identifier (SSID)

Wired Equivalent Privacy (WEP)

802.1X Access Control

Wireless Protected Access (WPA)

IEEE 802.11i


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Advantages

Mobility

Ease of Installation

Flexibility

Cost

Reliability

Security

Use unlicensed part of the radio spectrumRoaming

Speed


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Bluetooth vs. Wi-Fi

Bluetooth is in a variety of new products such as phones, printers,

modems, and headsets, to name a few. Bluetooth is acceptable for

situations when two or more devices are in close proximity with

each other and don't require high bandwidth.

Since Bluetooth uses short-range radio frequencies, it is not as

effective for setting up networks that can be accessed from remote

locations as with Wi-Fi.

Wi-Fi is more analogous to the traditional Ethernet network, and

requires configuration to set up shared resources, transmit files, set

up audio links , whereas Bluetooth devices advertise all services

they actually provide.


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Bluetooth vs. Wi-Fi

Wi-Fi uses the same radio frequencies as Bluetooth, but withhigher power consumption resulting in a stronger connection.

Wi-Fi is better suited for setting up networks as it enables afaster connection and has better security than Bluetooth.

As a traditional networking medium, Wi-Fi is more versatile,but harder to configure.

Most users need good know-how to get things set up,especially when using more obscure services such as audioand HID.


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Setting up and securing a

campus-wide Wi-Finetwork


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Define your Wi-Fi needs:

Types of connections

Speed of connection

Acceptable users

Cost and redundancy


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Site Survey:

What types of interference are you going tocontend with

What distances do you need to broadcast

What types of data are you going to support overWIFI

Setup worst-case scenario for testing

Know what your signal to Noise ratio You should be expect an interview before any

testing is done


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Site Survey: Report

Describe surveys basis, approach and results.

Define all requirements, and assumptions

Describe RF interference found Identify recommended installations locations and

channels for Access Points

Give a map with listing of RF strength, and list anydead spots


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A Case studyGCA:

GCA has two separate WIFI networks one is secured

and one is open.

Providing wireless ISP services for another school(secured)

Giving access to all staff on campus homes

(secured) The campus WIFI network for student access (not

secure)


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Campus Map External WIFI


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Campus Map External WIFI


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Hardware: Used @ GCA

Amplifier

Bridges 3COM work

Access Points

Client cards


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Photos Outside WIFI network

3Com 13 dBi Directional Sector

Panel Antenna (Homes)

3Com 11 Mbps Wireless

LAN Workgroup Bridge

3com Building to

Building Bridge

3Com 18 dBi Directional Sector

Panel Antenna (Ad Building and

Coble)


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Outside WIFI network cont.

Pigtail 3Com Workgroup BridgeSMA Cable Adapter

15 dBi Omni-Directional

Antenna

AMP244 500 mW

Outdoor Amplifier

3Com 20 foot Antenna

Cable

Used Radio Shack TV

Antenna mast


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Inside WIFI

Installing Meru A P (what is wrong?)

Meru AP100 Access Point

Meru Controller 1100 Blade


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Security: used @ GCA

Building to building Networks

Used non WIFI Compatible settings

WEP

MAC Address Filtering

Campus in the buildings

Separate from main school network

Open system

Radius ?


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THANK YOU


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Documents

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