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Communications Fundamentals Presentation ON Wi-Fi Technology

Communications Fundamentals Presentation ON Wi-Fi Technology. Submitted By:- Raushan Kr. Chaurasiya (68) Santu Thapa (75) Satyanarayan Prajapat (76). Contents. Introduction Wi-Fi Technologies Wi-Fi Network Elements How a Wi-Fi Network Works Wi-Fi Network Topologies

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Communications Fundamentals Presentation ON Wi-Fi Technology

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  1. Communications Fundamentals PresentationONWi-Fi Technology Submitted By:- Raushan Kr. Chaurasiya(68) SantuThapa(75) SatyanarayanPrajapat(76)

  2. Contents • Introduction • Wi-Fi Technologies • Wi-Fi Network Elements • How a Wi-Fi Network Works • Wi-Fi Network Topologies • Wi-Fi Configurations • Applications of Wi-Fi • Wi Fi Security • Advantages/ Disadvantages of Wi-Fi • 3G vs. Wi Fi • Conclusion

  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.

  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

  5. IEEE 802.11b • Appear 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.

  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

  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’

  8. 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 simultaneously to the Internet. • 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) • Safeguards - Firewalls and anti-virus software protect networks from uninvited users and keep information secure.

  9. How a Wi-Fi Network Works • Basic concept is same as Walkie talkies. • 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.

  10. Wi-Fi Network Topologies • AP-based topology (Infrastructure Mode) • Peer-to-peer topology (Ad-hoc Mode) • Point-to-multipoint bridge topology

  11. AP-based topology • The client communicate through Access Point. • BSA-RF coverage provided by an AP. • ESA-It consists of 2 or more BSA. • ESA cell includes 10-15% overlap to allow roaming.

  12. Peer-to-peer topology • AP is not required. • Client devices within a cell can communicate directly with each other. • It is useful for setting up of a wireless network quickly and easily.

  13. Point-to-multipoint bridge topology 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.

  14. Wi-Fi Configurations

  15. Wi-Fi Configurations

  16. Wi-Fi Configurations

  17. Wi-Fi Applications • Home • Small Businesses or SOHO • Large Corporations & Campuses • Health Care • Wireless ISP (WISP) • Travellers

  18. 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.

  19. Basic Wi-Fi Security Techniques(Contd.)

  20. Advantages of Wi-Fi • Mobility • Ease of Installation • Flexibility • Cost • Reliability • Security • Use unlicensed part of the radio spectrum • Roaming • Speed

  21. Disadvantages of Wi-Fi • Interference • Degradation in performance • High power consumption • Limited range

  22. 3G vs. WI-FI

  23. Conclusion • Wi Fi is a simple ,cost-effective way to connect to the internet,without the need of physically connecting wires. • In 1997 IEEE draftedthe 802.11 standard for wireless local area networking. • Hotspot is a geographical areasetup 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 has a several limitations that should be concerned.

  24. Any Questions.....

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