1. 802.11 DCF mode

Various amendments have been incorporated into the 2012 version of the IEEE 802.11 standard. The main amendments found in wireless cards on the market are :

• 802.11b operates in the 2.4 GHz frequency band and offers speeds of up to 11 Mb/s;

• 802.11a, which operates in the 5 GHz frequency band and offers speeds of up to 54 Mb/s;

• 802.11g, which operates in the 2.4 GHz frequency band and offers speeds of up to 54 Mb/s ;

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