A major difference between 802.11 a/b/g and 802.11 n is the difference of speed. The speed of 802.11 a/b/g is 5 GHz/ 2.4 GHz/ 2.4 GHz. on the other hand speed of 802.11 n is 2.4/5 GHz.
Another difference lies in range. Range of 802.11 a/b/g is 50/150/50 feet and the range of 802.11 n is 175 feet.
There is a huge difference in speed of these standards. The speed of 802.11 a/b/g is 54/11/54 Mbps and speed of 802.11 n is 300 Mbps to 400 Mbps.
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