wlan

Wireless Local Area Network

INDEX1)Introduction2)Advantages3)Disadvantages4)Types Of WLAN5)Practical Use Of WLAN

INTRODUCTION AND HISTORY OF WLAN

• What is WLAN? WLAN stands for Wireless Local Area Network. Sometimes it is also called Local Area Wireless Network (LAWN). Norman Abramson, a professor at the University of Hawaii,

developed the world’s first wireless computer communication network, ALOHA net (operational in 1971).

WLAN is a wireless computer network that links two or more devices (using-spectrum or OFDM radio) within a limited area such as a home, school, computer laboratory, or office building.

WLAN is a marketed under the Wi-Fi brand name. Wireless LANs have become popular in the home due to ease of

installation and use.

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ADVANTAGES OF WLAN

Installation flexibility.

Reduced cost-of-ownership.

Mobility

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Installation speed and simplicity• No cable to pull.• Few transmitters/receivers for multiple for users.

Reduced cost-of-ownership• Mobile devices are less expensive than computer

workstations.• No need to build wiring closets.

Mobility• Access to real-time information.• Provides service opportunities.• Promotes flexibility.• Supports productivity.

ADVANTAGES[Conti…]

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DISADVANTAGES OF WLAN

Cost

Environmental Conditions

Less Capacity

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DISADVANTAGES[Conti…]

Cost• Wireless network cards cost 4 times more than wired

network cards.• The access points are more expensive than hubs and wires.

Environmental Conditions• Susceptible to weather and solar activity.• Constrained by buildings, trees, terrain.

Less Capacity• Slower bandwidth.

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TYPES OF WLAN

Infrastructure

Peer-to-peer

Bridge

Wireless distribution system

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Infrastructure• Most Wi-Fi networks are deployed in infrastructure mode.• In infrastructure mode, a base station acts as a wireless

access point hub, and nodes communicate through the hub. The hub usually, but not always, has a wired or fiber network connection, and may have permanent wireless connections to other nodes.

• Wireless access points are usually fixed, and provide service to their client nodes within range.

• Wireless clients, such as laptops, smart phones etc. connect to the access point to join the network.

TYPES OF WLAN[Conti…]

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Peer To Peer


Two PCs equipped with wireless adapter cards can be set up as an independent network whenever they are within range of one another.

A peer-to-peer network allows wireless devices to directly communicate with each other.

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Bridge

• A bridge can be used to connect networks, typically of different types.

• A wireless Ethernet bridge allows the connection of devices on a wired Ethernet network to a wireless network.

• The bridge acts as the connection point to the Wireless LAN.


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Wireless distribution system

• A Wireless Distribution System enables the wireless interconnection of access points in an IEEE 802.11 network.


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Corporate

Education

Finance

Healthcare

PRACTICAL USE OF WLAN

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PRACTICAL USE[Conti…]

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Corporate• Mobile networking for e-mail, file sharing, and web

browsing.

Education• Connectivity to the University Network for collaborative

class activities.• Ability to access research sources without requiring a hard

point.

Finance• Traders can receive up-to-the-second pricing information.• Facilitates electronic payments for goods and services.• Improve the speed and quality of trades.

Healthcare• Emergency medical information readily available.• Access to schedule information.

PRACTICAL USE[Conti…]

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Thank You

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