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Anatomy of an 802.11 Wi-Fi Enterprise Wireless LAN

Anatomy of an 802.11 Wi-Fi Enterprise Wireless LAN. Chris De Herrera Pacific Crest Bank Chief Information Officer Webmaster, Tablet PC Talk, CEWindows.NET. Overview. Glossary of the terms used in Wi-Fi Wi-FI Characteristics Hardware Requirements Ad Hoc vs. Infrastructure Positioning APs

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Anatomy of an 802.11 Wi-Fi Enterprise Wireless LAN

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  1. Anatomy of an 802.11 Wi-Fi Enterprise Wireless LAN Chris De Herrera Pacific Crest Bank Chief Information Officer Webmaster, Tablet PC Talk, CEWindows.NET

  2. Overview Glossary of the terms used in Wi-Fi Wi-FI Characteristics Hardware Requirements Ad Hoc vs. Infrastructure Positioning APs Security Demonstration Competing Wireless LAN Options Questions and Answers

  3. Glossary 802.11, Wireless Ethernet, Wi-Fi - A wireless local area network protocol which allows high speed access to network resources.  It operates at 11, 5.5, 2 and 1 megabits per second depending on distance.  It uses the 2.4 ghz spectrum using direct sequence spectrum (DSS)..  WECA is the industry consortium which works with vendors on interoperability.  ESSID – Extended Service Set Identifier - Specifies which 802.11b network you are joining.  Some systems allow you to specify ANY SSID as an option so you can join any network. WEP - Wired Equivalent Privacy - the standard for encrypting data over an 802.11b wireless network. This 40 or 128 bit encryption has been shown to be insecure.  So the current recommendation is to use a VPN, limit MAC Address, or 802.1x to secure corporate data. Additional terms are defined at http://www.cewindows.net/glossary.htm

  4. Wi-Fi Characteristics • Supports 1,2,5.5 and 11mb/s speeds • Provides coverage of up to 500 feet indoors and 1500 feet outside • Up to 100mW of transmit power • Limited to 3 simultaneous channels of communication – This affects the coverage design for a given area to prevent overlapping channels • Half Duplex – Only one device can transmit at a time • Supports roaming between access points if they are on the same subnet and use the same SSID.

  5. Hardware Requirements • PC Card or Compact Flash Card – see http://www.cewindows.net/peripherals.htm (includes antenna sensitivity, power output, etc) • Access Point – Really just a bridge between Wi-Fi and Ethernet. • Local Area Network • Ethernet Switch

  6. Ad Hoc vs. Infrastructure • Ad Hoc is the term used to explain when a user is connecting to another 802.11b device directly without an access point. The user must decide what IP address and subnet to communicate. • Infrastructure is the term used to explain when a user is connecting to the wireless LAN using an Access Point. The Access Point or another network device can provide services like DHCP and NAT.

  7. Get a floorplan to indicate where to place APs to cover the area. Test for interference – 2.4 gHz equipment,Microwaves, OtherMetal Objects Test coverage Positioning APs

  8. Security • You need to secure your data that is sent via wireless. • Using WEP is not enough to prevent unauthorized access to your Wi-Fi LAN. WEP is easy to crack. • Limiting MAC addresses does not encrypt your data. • Using 802.1x limits who can access your Wi-Fi LAN but does not encrypt your data • Using a VPN encrypts your data and restricts who is authorized to access your Wi-Fi LAN • Don’t forget physical security of APs. • Future – 802.11i

  9. Demonstration • Basic configuration of a Linksys WAP11 Access Point

  10. Competing Wireless LAN Options • 802.11a – Current high speed standard – 54 mb/s. Uses 5 gHz. About ½ the coverage of Wi-Fi. • 802.11g – Up and coming standard that has not been ratified. Backward compatible with Wi-Fi. Operates at 54 mb/s. Uses 2.4 gHz. About the same coverage as Wi-Fi.

  11. Anatomy of an 802.11 Wi-Fi Enterprise Wireless LAN Questions and Answers Chris De Herrera Pacific Crest Bank Chief Information Officer Webmaster, Tablet PC Talk, CEWindows.NET

  12. Anatomy of an 802.11 Wi-Fi Enterprise Wireless LAN Chris De Herrera Pacific Crest Bank Chief Information Officer Webmaster, Tablet PC Talk, CEWindows.NET

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