Wireless Fidelity


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Wireless Fidelity

  1. 1. Wi-Fi Technologies JAI~MCA
  2. 2. <ul><li>JAI ~MCA </li></ul><ul><li>MCA~ (GGITS) </li></ul><ul><li>ROLL NO. 20 </li></ul>Wi-Fi (Wireless-Fidelity) Technologies
  3. 3. Wi-Fi Tech. Agenda <ul><li>Introduction </li></ul><ul><li>Purpose </li></ul><ul><li>Wi-Fi Alliance </li></ul><ul><li>The Wi-Fi Technology </li></ul><ul><li>Elements of a WI-FI Network </li></ul><ul><li>How a Wi-Fi Network Works </li></ul><ul><li>Wi-Fi Network Topologies </li></ul><ul><li>Wi-Fi Configurations </li></ul><ul><li>Wi-Fi Applications </li></ul><ul><li>Wi-Fi Security </li></ul><ul><li>Authentication </li></ul><ul><li>Advantages & Disadvantages </li></ul>
  4. 4. Intro. <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 Network connect computers to each other, to the internet and to the wired network. </li></ul><ul><li>Wi-Fi works on physical and data link layer. </li></ul>
  5. 5. Purpose <ul><li> The purpose of Wi-Fi is to hide complexity by enabling wireless access to applications and data, media and streams. </li></ul><ul><li>The main aims of Wi-Fi are the following: </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>
  6. 6. Wi-Fi Alliance <ul><li>The Alliance promotes standards with the aim of improving the interoperability of wireless local area network products based on the IEEE 802.11 standards. The Wi-Fi Alliance, a consortium of separate and independent companies, agrees on a set of common interoperable products based on the family of IEEE 802.11 standards.The Wi-Fi Alliance certifies products via a set of defined test-procedures to establish interoperability. The Wi-Fi Alliance initially complicated matters by stating that it actually stood for &quot;Wireless Fidelity&quot;, as with the advertising slogan&quot;The Standard for Wireless Fidelity&quot;, but later removed the phrase from their marketing. </li></ul>
  7. 7. 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>
  8. 8. IEEE 802.11b <ul><li>Appear in late 1999 </li></ul><ul><li>Operates at 2.4GHz radio spectrum </li></ul><ul><li>11 Mbps (theoretical speed) - within 30 m Range </li></ul><ul><li>4-6 Mbps (actual speed) </li></ul><ul><li>100 -150 feet range </li></ul><ul><li>Most popular, Least Expensive </li></ul><ul><li>Interference from mobile phones and Bluetooth devices which can reduce the transmission speed. </li></ul>
  9. 9. IEEE 802.11a <ul><li>Introduced in 2001 </li></ul><ul><li>Operates at 5 GHz (less popular) </li></ul><ul><li>54 Mbps (theoretical speed) </li></ul><ul><li>15-20 Mbps (Actual speed) </li></ul><ul><li>50-75 feet range </li></ul><ul><li>More expensive </li></ul><ul><li>Not compatible with 802.11b </li></ul>
  10. 10. IEEE 802.11g <ul><li>Introduced in 2003 </li></ul><ul><li>Combine the feature of both standards (a,b) </li></ul><ul><li>100-150 feet range </li></ul><ul><li>54 Mbps Speed </li></ul><ul><li>2.4 GHz radio frequencies </li></ul><ul><li>Compatible with ‘b’ </li></ul>
  11. 11. 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>
  12. 12. 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>
  13. 13. 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>
  14. 14. AP-based topology <ul><li>The client communicate through Access Point. </li></ul><ul><li>BSA-RF coverage provided by an AP. </li></ul><ul><li>ESA-It consists of 2 or more BSA. </li></ul><ul><li>ESA cell includes 10-15% overlap to allow roaming. </li></ul>
  15. 15. Peer-to-peer topology <ul><li>AP is not required. </li></ul><ul><li>Client devices within a cell can communicate directly with each other. </li></ul><ul><li>It is useful for setting up of a wireless network quickly and easily. </li></ul>
  16. 16. Point-to-multipoint bridge topology <ul><li>This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart. These conditions receive a clear line of sight between buildings. The line-of-sight range varies based on the type of wireless bridge and antenna used as well as the environmental conditions. </li></ul>
  17. 17. Wi-Fi Configurations <ul><li>Wi-Fi is composed of three main sectors: </li></ul><ul><li>Home (individual residences and apartment buildings) </li></ul><ul><li>Public (Round about 70,000 “hotspots” through out the world.) </li></ul><ul><li>Enterprise (corporations, universities, office parks) </li></ul>
  18. 18. Wi-Fi Configurations
  19. 19. Wi-Fi Configurations
  20. 20. Wi-Fi Configurations
  21. 22. Employee Access
  22. 23. 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>
  23. 24. Wi-Fi Security <ul><li>The requirements for Wi-Fi network security can be broken down into two primary components: </li></ul><ul><li>Authentication </li></ul><ul><li>Privacy </li></ul>
  24. 25. Wi-Fi Security Techniques <ul><ul><li>Service Set Identifier (SSID) </li></ul></ul><ul><ul><li>Wired Equivalent Privacy (WEP) </li></ul></ul><ul><ul><li>802.1X Access Control </li></ul></ul><ul><ul><li>Wireless Protected Access (WPA) </li></ul></ul><ul><ul><li>IEEE 802.11i </li></ul></ul>
  25. 26. Authentication <ul><ul><li>Authentication Server is used </li></ul></ul><ul><ul><li>Username and password </li></ul></ul><ul><ul><li>Risk: </li></ul></ul><ul><ul><ul><li>Data (username & password) send before secure channel established </li></ul></ul></ul><ul><ul><li>Solution </li></ul></ul><ul><ul><ul><li>Establishing a encrypted channel before sending username and password </li></ul></ul></ul>
  26. 27. 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>
  27. 28. Limitations OR Disadvantages <ul><li>Interference </li></ul><ul><li>Degradation in performance </li></ul><ul><li>High power consumption </li></ul><ul><li>Limited range </li></ul>
  28. 29. THANK YOU