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WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
WIFI[autosaved]
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WIFI[autosaved]

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Transcript

  • 1. March 03, 2010 WI RELESS FI DELITY (Wi-Fi) WELCOME TO THE WORLD OF WIRELESS
  • 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. December 17, 2002
  • 13. December 17, 2002
  • 14. December 17, 2002
  • 15. December 17, 2002
  • 16. CONCLUSION March 03, 2010
  • 17. Questions December 17, 2002
  • 18. THANK YOU! December 17, 2002

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