Wifi Technology ppt

this presentation base on wifi technology.in there i am discuss 21 slide about wifi technology.its most help full in our seminar.

1. BY NAME-SABIR ALI MOLLAH ROLL NO.-ECE13407 SUB.-SEMINAR II SUB.CODE-ECE481 ALIAH UNIVERSITY Wi-Fi Technology 1 PRESENTATION ON

2. Outlines Introduction Wi-Fi Standards Wi-Fi Network Elements How a Wi-Fi Network Works Advantages and Limitations of Wi-Fi Wi-Fi Security Conclusion Reference 2

3. Introduction Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode. Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLANs). Wi-Fi Network connect computers to each other, to the internet and to the wired network. Wi-Fi works on physical and data link layer.

4. THE Wi-Fi TECHNOLOGY Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed : IEEE 802.11b IEEE 802.11a IEEE 802.11g IEEE 802.11n

5. IEEE 802.11b Appeared in late 1999 Operates at 2.4GHz radio spectrum 11 Mbps (theoretical speed) - within 30 m Range 4-6 Mbps (actual speed) 100 -150 feet range Most popular, Least Expensive Interference from mobile phones and Bluetooth devices which can reduce the transmission speed. 5

6. IEEE 802.11a Introduced in 2001 Operates at 5 GHz (less popular) 54 Mbps (theoretical speed) 15-20 Mbps (Actual speed) 50-75 feet range More expensive Not compatible with 802.11b 6

7. IEEE 802.11g Introduced in 2003 Combine the feature of both standards (a,b) 100-150 feet range 54 Mbps Speed 2.4 GHz radio frequencies Compatible with ‘b’ 7

8. IEEE 802.11n Introduced in 2009 Up To 300 feet range 200 Mbps Speed 2.4 & 5 GHz radio frequencies 8

9. IEEE 802.11 standard (cont.) Network standard Maximum Speed (Mbps) Range (feet) Frequency (GHz) Power drain Cost 802.11b 11 100-150 2.4 Moderate Low 802.11a 54 60-100 5 High High 802.11g 54 150-250 2.4 Moderate Moderate 802.11n 2 00 Up to 300 feet 2.4 & 5 Moderate Moderate 9

10. Elements of a Wi-Fi Network Access Point (AP) - The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices in the same time to the Internet. Safeguards - Firewalls and anti-virus software protect networks from uninvited users and keep information secure. Wi-Fi cards (Adapters) - They accept the wireless signal and relay information. They can be internal and external. 10

11. PCI and USB adapters PCI adapter USB adapter 11 PCMCIA adapter (Internal) (External) For Desktop For Laptop

12. How a Wi-Fi Network Works A Wi-Fi hotspot is created by installing an access point to an internet connection. An access point acts as a base station. When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly. A single access point can support up to 30 users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors. Many access points can be connected to each other via Ethernet cables to create a single large network.

13. How a Wi-Fi Network Works ? 13

14. Wi-Fi Applications Home Small Businesses Large Corporations & Campuses Health Care Wireless ISP (WISP) Travellers Wi-Fi Camera

15. Advantages of Wi-Fi No Wires   - A truly wireless networking solution. No Waiting  - Fast, easy deployments. No Worries   - A wireless networking system that is secure, easy to manage, and built to grow with you. Ease of Installation - Quick, easy setup. Security - Many Types Of Security(WEP,WPA,WPA2) Fast data transfer rates   15

16. Limitations of Wi-Fi Limited range Interference from other devices  : such as telephones, microwave ovens. High power consumption :making battery life and heat a concern . Data security risks :a huge challenge for Wi-Fi networks 16

17. Basic Wi-Fi Security Techniques WEP (Wired Equivalent Privacy) : The original encryption technique specified by the IEEE 802.11 standard. WPA (Wi-Fi Protected Access ): A new standard that provides improved encryption security over WEP. WPA2 : is an improved version of WPA that uses Advanced Encryption Standard (AES) technology. 17

18. Basic Wi-Fi Security Techniques(cont.) Securing Method Encryption Type Used Security Level Notes WEP RC4 encryption algorithm Low No longer used; it is can be hacked easily WPA TKIP Protocol High provides improved encryption security over WEP WPA2 CCMP Protocol Very High An improved version of WPA that uses Advanced Encryption Standard 18

19. Conclusion Wi-Fi is a simple, cost-effective way to connect to the Internet, without the need to physically connecting wires. In 1997 IEEE drafted the 802.11 standard for wireless local area networking. Hotspot is a geographic area setup in any public location, and has a readily accessible wireless network. Security is a huge challenge for Wi-Fi Networks, many Security Techniques are used to improve it. Wi-Fi Networks have a several limitations that should be concerned. 19

20. REFERENCE www.Wi-Fitechnology.com www.webopedia.com www.wavewireless.com www.wikipedia.com BOOK 802.11 Wirless Networks:The Definitive Guide -Matthew Gast How Does Wifi Works -Matt Anniss