802.11
Maximum network bandwidth of 2 Mbps
Frequency of 2.4Ghz
802.11b
Supports bandwidth up to 11 Mbps.
Frequency of 2.4Ghz
Microwave ovens and Cordless phones interfere.
802.11a
Supports bandwidth up to 54 Mbps
Frequency of 5Ghz
Higher frequency also means more difficulty penetrating walls and other obstructions.
802.11g
Combine the best of both 802.11a and 802.11b.
Supports bandwidth up to 54 Mbps.
Frequency of 2.4Ghz.
Backwards compatible with 802.11b.
Appliances may interfere on the unregulated signal frequency
802.11n
Improved on 802.11g
Supports bandwidth up to 300 Mbps
backward-compatible with 802.11b/g