WIFI[autosaved]

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WIFI[autosaved]

  1. 1. March 03, 2010 WI RELESS FI DELITY (Wi-Fi) WELCOME TO THE WORLD OF WIRELESS
  2. 2. INTRODUCTION <ul><li>Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode. </li></ul><ul><li>Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLANs). </li></ul><ul><li>Wi-Fi is a commonly used wireless network in computer systems to enable connection to the internet or other machines that have Wi-Fi functionalities </li></ul><ul><li>Wi-Fi works on physical and data link layer. </li></ul>
  3. 3. Purpose Of Wi-Fi <ul><li>Hide complexity </li></ul><ul><li>Make access to information easier </li></ul><ul><li>Ensure compatibility and co-existence of devices </li></ul><ul><li>Eliminate cabling and wiring </li></ul><ul><li>Eliminate switches, adapters, plugs, pins and connectors </li></ul>
  4. 4. The Wi-Fi Technology <ul><li>Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: </li></ul><ul><ul><li>IEEE 802.11b </li></ul></ul><ul><ul><li>IEEE 802.11a </li></ul></ul><ul><ul><li>IEEE 802.11g </li></ul></ul><ul><ul><li>IEEE 802.11n </li></ul></ul>
  5. 5. How a Wi-Fi Network Works <ul><li>Basic concept is same as Walkie talkies. </li></ul><ul><li>A Wi-Fi hotspot is created by installing an access point to an internet connection. </li></ul><ul><li>An access point acts as a base station. </li></ul><ul><li>When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly. </li></ul><ul><li>A single access point can support up to 30 users and can function within a range of 100 up to 300 feet. </li></ul><ul><li>Many access points can be connected to each other via Ethernet cables to create a single large network. </li></ul>
  6. 6. Elements of a WI-FI Network <ul><li>Access Point (AP) - The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices simultaneously to the Internet. </li></ul><ul><li>Wi-Fi cards - They accept the wireless signal and relay information.They can be internal and external.(e.g PCMCIA Card for Laptop and PCI Card for Desktop PC) </li></ul><ul><li>Safeguards - Firewalls and anti-virus software protect networks from uninvited users and keep information secure. </li></ul>
  7. 7. Wi-Fi Network Topologies <ul><li>AP-based topology (Infrastructure Mode) </li></ul><ul><li>Peer-to-peer topology (Ad-hoc Mode) </li></ul><ul><li>Point-to-multipoint bridge topology </li></ul>
  8. 8. Two Modes to Choose From <ul><li>Wi-Fi can be implemented in an… </li></ul><ul><li>Ad-hoc or Independent Basic Service Set </li></ul><ul><li>Infrastructure or Basic Service Set </li></ul>March 03, 2010
  9. 9. Wi-Fi and Security <ul><li>Security is an issue because: </li></ul><ul><li>Adoption was the goal </li></ul><ul><li>Access points are usually behind firewall </li></ul><ul><li>Existing security measures are “inadequate” </li></ul>December 17, 2002
  10. 10. Advantages <ul><li>Mobility </li></ul><ul><li>Ease of Installation </li></ul><ul><li>Flexibility </li></ul><ul><li>Cost </li></ul><ul><li>Reliability </li></ul><ul><li>Security </li></ul><ul><li>Use unlicensed part of the radio spectrum </li></ul><ul><li>Roaming </li></ul><ul><li>Speed </li></ul>
  11. 11. Wi-Fi Applications <ul><li>Home </li></ul><ul><li>Small Businesses or SOHO </li></ul><ul><li>Large Corporations & Campuses </li></ul><ul><li>Health Care </li></ul><ul><li>Wireless ISP (WISP) </li></ul><ul><li>Travellers </li></ul>
  12. 12. December 17, 2002
  13. 13. December 17, 2002
  14. 14. December 17, 2002
  15. 15. December 17, 2002
  16. 16. CONCLUSION March 03, 2010
  17. 17. Questions December 17, 2002
  18. 18. THANK YOU! December 17, 2002

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