关于IEEE 802．3的CSMA／CD协议，下面结论中错误的是()。
- A.CSMA／CD是一种解决访问冲突的协议
- B.CSMA／CD协议适用于所有802.3以太网
- C.在网络负载较小时，CSMA／CD协议的通信效率很高
- D.这种网络协议适合传输非实时数据
正确答案及解析
正确答案
解析
CSMA／CD是一种分解访问冲突的协议，应用在竞争发送的网络环境中，适合于传送非实时数据。在网络负载较小时，发送的速度很快，通信效率很高。在网络负载很大时，由于经常出现访问冲突，通信的效率很快就下降了。在千兆以太网中，当采用半双工传输方式时．要使用CSMA／CD协议来解决信道的争用问题。千兆以太网的全双工方式适用于交换机到交换机，或者交换机到工作站之间的点对点连接，两点问可同时进行发送与接收，不存在共享信道的争用问题，所以不需要采用CSMA／CD协议。2002年6月发布的万兆以太网802．3ael0GE标准只支持全双工方式，不支持单工和半双工，也不采用CSMA／CD协议。
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