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Wi-Fi (802.11)

Wi-Fi (802.11) is a suite of specifications for wireless Ethernet.

802.11 security is a significant concern because 802.11 (Wi-Fi) networks can allow almost untraceable entry into networks.

The 802.11 (Wi-Fi) Standards

The 802.11 standards are defined by the IEEE (Institute of Electrical and Electronic Engineers) at http://grouper.ieee.org/groups/802/11/.

Standard Speed Frequency Modulation
802.11 2Mb 2.4GHz Phase-Shift Keying
802.11a 54Mb 5GHz Orthogonal Frequency Division Multiplexing
802.11b 11Mb 2.4GHz Complementary Code Keying
802.11g 54Mb 2.4GHz Orthogonal Frequency Division Multiplexing

The 802.11 (Wi-Fi) Channels

The most common 802.11 specification, 802.11b, defines twelve channels. These channels utilize overlapping frequencies. Channels one, six, and eleven do not overlap.

Channel US Frequency European Frequency Japanese Frequency
1 2412    
2 2417    
3 2422 2422  
4 2427 2427  
5 2432 2432  
6 2437 2437  
7 2442 2442  
8 2447 2447  
9 2452 2452  
10 2457 2457  
11 2462 2462  
12     2484

For more information on Wi-Fi, visit 802.11 at Hackers Central.

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