![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
IEEE 802.11 的 MAC 层协议是()
A.SMA/CD
B.SMA/CA
C.Token Ring
D.TDM
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、SMA/CA
解析:IEE80211采用了类似于IEE8023CSMA/CD协议的载波侦听多路访问/冲突避免协议(CARRIERSENSEMULTIPLEACESS/COLLISIONAVOIDANCECSMA/CA)不采用CSMA/CD协议的原因有两点①无线网络中接收信号的强度往往远小于发送信号因此要实现碰撞的花费过大;②隐蔽站(隐蔽终端问题)
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)