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The IEEE 802.11 Wireless LAN standard is one of the most popular wireless standards in the market today. Since 1997 when the first version of the IEEE 802.11 was launched in the market, a lot of different versions has been announced and developed. In this paper, a comprehensive evaluation analysis of the IEEE 802.11b and IEEE 802.11g has been carried out, examining the performance of both standards at the MAC sub-layer, in terms of QoS, using two different simulation tools. Finally, the comparison for both cases is discussed.