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Currently, Wi-Fi is by far the most widely-adopted type of wireless networking Not only do thousands of private businesses and homes have wireless networks, but many public places such as coffee shops and libraries also offer Internet access through wireless networks Technically, only wireless devices that conform to the extended versions of the 80211 standard 80211a, 80211b, and 80211g are Wi-Fi certified Wi-Fi certification comes from the Wi-Fi Alliance (formerly the Wireless Ethernet Compatibility Alliance, or WECA), a nonprofit industry group comprising more than 175 member companies who design and manufacturer wireless networking products Wi-Fi certification ensures compatibility between wireless networking devices made by different vendors First-generation devices that use the older 80211 standard are not Wi-Fi certified, and so may or may not work well with devices made by different vendors Wireless devices can communicate only with other wireless devices that use the same standard The exception to this is 80211g, which is backwardcompatible with 80211b (although at the slower speed of 80211b) The following paragraphs describe the important specifications of each of the popular 80211-based wireless networking standards
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Devices that use the original 80211 (with no letter) standard are rare these days You re likeliest to find them in service on some brave early wireless adopter s network The original 80211 standard was hampered by both slow speeds (2 Mbps maximum) and limited range (about 150 feet) 80211 employed some of the same features in use in the current wireless standards 80211 uses the 24 GHz broadcast range, and security is provided by the use of industry-standard WEP and WPA encryption
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80211a Despite the a designation of this extension to the 80211 standard, 80211a was actually developed after 80211b 80211a differs from the other 80211-based standards in significant ways Foremost is that it operates in a different frequency range, 5 GHz This less-popular frequency range means that 80211a devices are less prone to interference from other devices 80211a also offers considerably greater throughput than 80211 and 80211b, reaching speeds up to 54 Mbps Range, however, suffers somewhat, topping out at about 150 feet Despite the superior speed of 80211a, it isn t widely adopted in the PC world 80211b Currently the reigning king of wireless networking standards, 80211b is practically ubiquitous The 80211b standard supports data throughput of up
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CHAPTER 14 Networks: Wireless Networking
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to 11 Mbps on par with older wired 10BaseT networks and offers a range of up to 300 feet under ideal conditions 80211b networks can be secured though the use of WEP and WPA encryption The main downside to using 80211b is, in fact, that it s so popular The 24 GHz frequency is already a crowded place, so you re likely to run into interference from other wireless devices 80211g The latest and greatest version, 80211g, offers data transfer speeds of up to 54 Mbps, equivalent to the 80211a standard, and the wider 300-foot range of 80211b More important, 80211g is backward-compatible with 80211b, meaning that an 80211g WAP can service both 80211b and 80211b wireless nodes Table 141 compares the important differences between the versions of the 80211 standard
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80211a
80211b
80211g
Max Throughput Max Range Frequency Security
54 Mbps 150 feet 5 GHz SSID, MAC filtering, industry-standard WEP, WPA 80211a DSSS Ad hoc or infrastructure Products that adhere to this standard are considered Wi-Fi Certified Eight available channels Less prone to interference than 80211b and 80211g
11 Mbps 300 feet 24 GHz SSID, MAC filtering, industry-standard WEP, WPA 80211b DSSS Ad hoc or infrastructure Products that adhere to this standard are considered Wi-Fi Certified Fourteen channels available in 24 GHz band (only 11 can be used in the US due to FCC regulations) Three non-overlapping channels
54 Mbps 300 feet 24 GHz SSID, MAC filtering, industry-standard WEP, WPA 80211b, 80211g DSSS Ad hoc or infrastructure Products that adhere to this standard are considered Wi-Fi Certified Improved security enhancements Fourteen channels available in 24 GHz band (only 11 can be used in the US due to FCC regulations) Three non-overlapping channels
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