Wi fi
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Wi fi

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this is my first presntattion

this is my first presntattion

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    Wi fi Wi fi Presentation Transcript

    • WIRELESS FIDELITY
      Wi-Fi
      NirajsinghChauhan
      B.Tech CS
      MAIIT
    • CONTENTS
      Wi-Fi Security
    • INTRODUCTION
      Wi-Fi is a WLAN
      Uses radio frequency to transmit data through the air
      Connect computers to each other to the internet and to the wired network
    • THE WI-FI TECHNOLOGIES
      Wi-Fi networks use radio technologies to transmit and receive data at high speed.
      IEEE 802.11b
      IEEE 802.11a
      IEEE 802.11g
      • In 2001
      • Operates at 5 GHz
      • 15-20 Mbps (Actual speed)
      • 50-75 feet range
      • More expensive
      • Not compatible with 802.11b
      • In late 1999
      • Operates at 2.4GHz
      • 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
      • 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’
    • Elements of a WI-FI Network
      • Access Point (AP) - A wireless LAN transceiver or base station.
      • Wi-Fi cards – Accept the wireless signal and relay information. They can be internal and external.
      • Safeguards - Firewalls and anti-virus software protect networks.
    • Wi-Fi Network Topologies
      • AP-based topology (Infrastructure Mode)
      • Peer-to-peer Technology (Adhoc mode)
      • Point-to-multipoint bridge topolgy
    • AP-based topology
      • Communicate through AP.
      • BSA-RF coverage provided by an AP.
      • ESA-It consists of 2 or more BSA.
      • ESA cell includes 10-15% overlap to allow roaming.
    • 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.
    • Point-to-multipoint bridge topology
      • Use Line -of-Sight (LoS)strategy.
      • Used to connect a LAN between buildings which are miles apart.
    • 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.
      • Wi-Fi enabled device encounters a hotspot, the device can then connect to that network wirelessly.
      • Each AP can support up to 30 users within a range of 100 – 150 ft indoors and 300 ft outdoors.
    • Wi-Fi security
      • Data Integrity
      • Encryption
      • Authentication
    • Future of Wi-Fi security
      The future of Wi-Fi security will be very bright if we overcome the security problems in the present technologies. And if we protect Wi-Fi from these security problems we have long way to produce great technologies under Wi-Fi networking in future.
    • Wi-Fi Security Problems
      • Modulation Spectrum Technique
      • Change Default Passwords
      • Wired Equivalent Privacy (WEP)
      • Crackers
      • Service Set Identifier (SSID)
    • Wi-Fi Applications
      • Home
      • Small Businesses or SOHO
      • Large Corporations & Campuses
      • Health Care
      • Wireless ISP (WISP)
      • Travellers
    • Advantages
      • Mobility
      • Ease of Installation
      • Flexibility
      • Cost
      • Reliability
      • Security
      • Roaming
      • Speed
    • Limitations
      • Interference
      • Degradation in performance
      • High power consumption
      • Limited range
    • CONCLUSION
      Wireless Fidelity is common now. We are expecting more on this technology in future. Let’s hope for that ….
    • >>Any Queries<<