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Wireless Networks

Wireless Networks






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    Wireless Networks Wireless Networks Presentation Transcript

    • The Wireless Network
    • Implementing Wireless
      • Access point (AP) or
      • Wireless router w/ firewall
      • Wireless card or adapter (PC card)
      • Repeaters
    • Access Point (AP)
      • Dedicated AP – has radio that serves as a bridge between the wired and wireless network
      • a hardware device or a computer's software that acts as a communication hub for users of a wireless device to connect to a wired LAN
      • Important for providing heightened wireless security and for extending the physical range of service
      • Security gateways intercept wireless traffic as it passes from AP to wired network for authentication of messages
    • IEEE 802.11 Wireless
      • 802.11b – (late 1999) most widely implemented and compatible with “g”
      • All hot spots are 802.11b
      • 802.11a – (late 2001) incompatible with “b” and “g” products
      • 802.11g – (mid 2003) compatible with “b” at “b” throughput
      • Theoretically 5x faster than “b”
      • 802.11a/g – (mid 2003) can be used at hot spots
    • Throughput 15-20 Mbps 54 Mbps 2.4 and 5 802.11a/g 15-20 Mbps 54 Mbps 2.4 802.11g 15-20 Mbps 54 Mbps 5 802.11a 4-6 Mbps 11 Mbps 2.4 802.11b Usable at 20’-60’ Throughput (Max) Frequency GHz Standard
    • Hot Spots
      • Areas offering wireless online access to anyone with an 802.11b wireless LAN card
      • Hot spots may be unsecured wireless servers
      • If you are working off-line, remove your wireless card or disconnect from the network.
      • To check for hotspots or learn how to set up wireless go to
      • http://www.jiwire.com/?cid=140
    • Wireless Security
      • Wireless Equivalency Protocol (WEP) –
        • Older protocol using encryption
        • Not considered secure against hackers
      • Wi-Fi Protected Access (WPA) –
        • Stronger security that fixes weaknesses in WEP. Look for Wi-Fi on the seal.
      • Security is usually not implemented and must be configured by the administrator
    • Implementing Wi-Fi Protected Access (WPA)
      • You must have
      • an access point (AP) or wireless router w/WPA support
      • a wireless network card with WPA drivers
      • a client (aka supplicant) that supports WPA and your OS
    • Le finis
      • that’s all on wireless for the time being!