Which is the contention method 802.11 wireless uses?

802.11 uses a contention method of Carrier Sense Multiple Access/Collision Avoidance. 802.11 implements a Request-to-Send/Clear-to-Send mechanism that avoids collisions. Ethernet uses a contention method of Carrier Sense Multiple Access/Collision Detection. Both Direct-Sequence Spread Spectrum (DSSS) and Orthogonal Frequency Division Multiplexing (OFDM) are wireless modulations used to transmit data.