Presented by

WUSL (2010-2011 batch)

Wi-Fi Introduction Scope of Wi-Fi Working principle Products Building a Wi-Fi Network Wi-Fi Security

Agenda

Wireless Fidelity (Wi-Fi)Welcome to the World of Wireless

A radio technology that networks the devices.

Refers to wireless LAN products based on the IEEE 802.11g specification

Provides easy connections to the internet and business networks while traveling

The main attractive feature of this technology is that it can provide wireless broadband connection within a specific geographic boundary.

In few more years all electronic devices are going to have a built in Wi-Fi..

So once again we welcome to World of wireless. Many colleges and businesses have suitable building layouts that can be wireless to build a unwired network. Wi-Fi is a very cost effective alternative in

these environments.

SCOPE OF Wi-Fi

Operating modes

Infrastructure Mode

AD HOC Mode

Building a WiFi

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.

Wireless Local Area Networking

The Beat Goes on..

Locating Hotspots

There are many Wi-Fi hotspots now available in public places like

restaurants, hotels, libraries and airports. For example, Katunayake Airport, The number of hotspots in the

world is growing daily.

Wi-Fi TopologiesAP Based TopologyPeer to peer TopologyPoint to multi-point bridge Topology

The client communicates through Access Point.

It connects the PC’S by an AP. It consists of 2 or Base Stations. It includes 10-15% overlap to allow roaming.

AP-based topology

Peer to peer Topology

Access Point is not required. Client devices within a cell can

communicate directly with each other.

It is useful for setting up of a wireless network quickly and easily.

Point-to-multipoint bridge topology

Used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart.

Range varies based on the type of wireless bridge and antenna used as well as the environmental conditions.

Wireless FidelityAdvantages

Can be used in Mobile. Widely available in public

venues. Relatively inexpensive. Easy to set up a network. User-friendly software. Security features. Global set of standards.

DisadvantagesSpectrum assignments & operational limitations

Power consumption is fairly highDegradation in performanceNetworks have limited rangeUsed to steal personal and confidential information

WEP stands for Wired Equivalency Privacy

As its name implies, this standard was intended to make wireless networks as secure as wired networks.

The common key lengths are currently 128- and 256-bit.

WPA Wi-Fi Protected Access is an early version of the 802.11b security standard that was developed by the Wi-Fi Alliance to replace WEP.

Wi-Fi Security

A SPECIAL SECURITY SOFTWARE

Wi-Fi Cameras used in BANKS

Conclusion

“Things that think…

don’t make sense unless they link.”