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Wireless networking has changed the face of computing, especially for the mobile professional. It is based on a set of protocols described by the Institute of Electrical and Electronics Engineers (IEEE). The specific set of IEEE protocols that describe wireless networking are the IEEE 802.11 protocols. The Wi-Fi Institute tests and certifies specific products that use the IEEE 802.11 protocols for compatibility and adherence to the standard to ensure that wireless products from different manufacturers will interoperate correctly. Because wireless networking uses electromagnetic waves to transmit information, anyone with a suitable receiver has access to a wireless network transmission. This makes security a critical part of wireless networking. The original encryption standard for wireless networking was Wired Equivalent Privacy (WEP). The encryption used in WEP has proven to be critically flawed and subject to relatively easy compromise. Windows XP Service Pack 2 provides support for Wi-Fi Protected Access (WPA), an improved encryption protocol that provides increased security without requiring additional hardware. Additionally, the IEEE 802.1x protocol can be used for authentication.



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The proliferation of public wireless access points or hot spots has changed the mobile network landscape. Anyone with a wireless networking card can find free or inexpensive public broadband Internet access at a wide variety of locations worldwide everything from coffee shops to airports, from bookstores to hotels.

The primary wireless Local Area Network (WLAN) solution is IEEE 802.11, which is the WLAN standard developed by the Institute of Electrical and Electronics Engineers (IEEE). There are currently specifications for IEEE 802.11b, IEEE 802.11a, IEEE 802.11g in general use, with IEEE 802.11h, IEEE 802.11i, and IEEE 802.11n on the horizon. In this section, we ll try to explain the many variations of 802.11.





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IEEE 802.11 is a shared WLAN standard using the carrier sense multiple access media access control protocol with collision avoidance. The standard allows for both direct sequence and frequency-hopping spread spectrum transmissions at the physical layer. The original 802.11 specification defines data rates of 1 Mbps and 2 Mbps and uses radio frequencies in the 2.4-GHz ISM (Industrial Scientific, and Medical) band. This standard, while still in effect, has been essentially supplanted by later specifications.

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802.11b

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The first major enhancement to the original IEEE 802.11 specification was the IEEE 802.11b specification adopted in 1999. It provides for standardization of the physical layer to support higher bandwidth than the original IEEE 802.11. IEEE 802.11b supports two additional speeds, 5.5 Mbps and 11 Mbps, using the same frequency of 2.45 GHz. A different modulation scheme is used to provide the higher data rates of 5 Mbps and 11 Mbps. Direct sequence spread spectrum (DSSS) is the physical layer defined in the 802.11b standard. 802.11b uses Complementary Code Keying (CCK) to achieve a maximum of 11 Mbps.

802.11a

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The IEEE 802.11a standard, adopted in 1999, operates at a data transmission rate as high as 54 Mbps and uses radio frequencies in the 5-gigahertz (GHz) range. Instead of DSSS and CCK, which 802.11b uses, 802.11a uses Orthogonal Frequency Division Multiplexing (OFDM). ODFM allows data to be transmitted by sub-frequencies in parallel. This provides greater resistance to interference and provides greater throughput. This higher speed technology allows wireless networking to perform better for video and conferencing applications. Because they are not on the same frequencies as Bluetooth or microwave ovens, OFDM and IEEE 802.11a provide both a higher data rate and a cleaner signal.

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802.11g

The IEEE 802.11g standard, adopted in 2003, operates at a data transmission rate as high as 54 Mbps and uses radio frequencies in the 2.4-gigahertz (GHz) ISM band, the same frequency as 802.11b. Instead of DSSS and CCK, which 802.11b uses, 802.11g uses Orthogonal Frequency Division Multiplexing (OFDM) and Packet Binary Convolution Coding (PBCC). Using ODFM, the IEEE 802.11g standard supports a maximum speed of 54 Mbps. The IEEE 802.11g standard provides for backward compatibility with the 802.11b standard, enabling easy deployment into existing 802.11b networks.

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802.11h

The IEEE 802.11h standard, adopted in 2004, operates at a data transmission rate as high as 54 Mbps and uses radio frequencies in the 5-gigahertz (GHz) range. It extends the IEEE 802.11a standard to enable use in Europe and prevent interference with existing devices.

802.11i

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The IEEE 802.11i standard, adopted in June 2004, extends and defines the security parameters used by wireless devices. The original Wired Equivalent Privacy (WEP) method of encryption has proven inadequate and flawed, and an interim standard, Wi-Fi Protected Access (WPA), is incorporated as a subset of IEEE 802.11i, as is the IEEE 802.1x Authentication Protocol. Full support for IEEE 802.11i will likely require new hardware to handle the Advanced Encryption Standard (AES).

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