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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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Presentation on theme: "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."— Presentation transcript:

1 Anatomy of an 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 , 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. WECA ESSID – Extended Service Set Identifier - Specifies which b 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 b 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

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

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 Dont forget physical security of APs. Future – i

9 Demonstration Basic configuration of a Linksys WAP11 Access Point

10 Competing Wireless LAN Options a – Current high speed standard – 54 mb/s. Uses 5 gHz. About ½ the coverage of Wi-Fi g – 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 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 Wi-Fi Enterprise Wireless LAN Chris De Herrera Pacific Crest Bank Chief Information Officer Webmaster, Tablet PC Talk, CEWindows.NET


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