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Presentation on Wi-Fi (802.11b) Network Performance and Applications
Presented by: Shubham Aggarwal |
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Presentation Outline Introduction
Overview of Wi-Fi Technology
Advantage, Disadvantage and Security
Range and Performance
Design and Cost
Selection Criteria
Vendors
Question or Comments |
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Introduction Two prominent wireless technologies:
WPAN: Wireless Personal Area Networking
supports a short range (10m), implemented in Bluetooth
applications such as wireless headsets, PDAs, keyboards, mice, etc.
WLAN: Wireless Local Area Networking
supports wider range (100m), designed in Wi-Fi (802.11b)
applications such as wireless routers, wireless cards, wireless printers, etc.
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What is Wi-Fi Short for wireless fidelity and is meant to be used generically when referring to any type of 802.11 network, whether 802.11b, 802.11a, 802.11g, dual-band etc.
Wi-Fi is a wireless technology that uses radio frequency to transmit data through the air. |
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Brief History of the Technology IEEE (Institute of Electrical and Electronics Engineers) established the 802.11 Group in 1990. Specifications for standard ratified in 1997.
Initial speeds were 1 and 2 Mbps.
IEEE modified the standard in 1999 to include 802.11 a and b.
802.11g was added in 2003.
802.11b equipment first available, then a, followed by g.
IEEE create standard but Wireless Ethernet Compatibility Alliance certifies products. |
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What can you do with it Quick/easy temporary network access.
Staff access to Corporate network.
Patron internet access (hotspot).
Interconnecting two networks. |
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What do you need to do Wi-Fi Existing wired network/services
(Infrastructure Mode)
DHCP/DNS
Access point
Antennas and bridges
Wireless adapter. |
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Why Wi-Fi Setup Cost – Reduced cabling required
Flexibility – Quick and easy to setup in temporary or permanent space
Scalable – Can be expanded with growth
Freedom – You can work from any location that you can get a signal
Lower total cost of ownership – Because of affordability and low install cost
Additionally
Mobile Users – Can access the Corporate network from any public hotspot using VPN. |
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Disadvantages Planning – Depending on the goal
Security – Greater exposure to risks via:
Unauthorised Access
Compromising Data
Denial of Service
Speed – Slower than cable
Range – Affected by various mediums
Travels best through open space
Reduced by walls, glass, water, etc. |
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Security Data Security/Encryption
Third Party solution – Fortress
Wi-Fi Protected Access (WPA)
Wired Equivalent Privacy (WEP)-Shared key
Access
WPA/WEP
Close System – No advertising
MAC Authentication – MAC address control
Attack – Denial of Service
Client Protection
Antivirus/Firewall |
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Range and Performance Performance decreases as distance increases
For 802.11a-
Indoor 40-300 feet
Outdoor – 100 to 1000 feet
For 802.11b-
Indoor 100-300 feet
Outdoor 400 – 1500 feet
Interference - doors, walls, furniture, ceiling
253 maximum number of client per AP, but 15-20 recommended. |
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Infrastructure/Design Option 1 – Provide patron access using a totally separate network Infrastructure
Option 2 – Use the existing corporate network, with additional equipment to provide access to patrons while securing internal network
Option 3 – Use the existing corporate network, with same equipment to provide access to patrons while securing internal network. |
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Selection criteria to consider Standards – 802.11a, b, or g?
Features – Does it have all of the services that you need?
Upgradeability – Support for firmware upgrades?
Aesthetics – Looks good?
Security – Has WEP for encrypting data and controlling access?
Range – How strong is the signal, does it accommodate an antenna?
Installation and Support Tools – Company reputation?
Price – Does it fit in your budget?
Availability – Can you buy it now?
Manageable – Can you manage it remotely?
Certified – Is it “Wi-Fi Certified”? |
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Vendors Netgear
D-Link
Linksys
Proxim
Cisco
Enterasys
Avaya
Aruba Networks |
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Questions or Comments?
Thank you! |
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