Five types of access protocols in computer local area networks are studied in this paper,They are Carrir-sense multiple access with collision detection ( CSMA/CD ), Token passing bus,Token ring,Time-division multiple access and Polling.

• 本文研究了计算机局部网络的五种访问协议:载波监听多次访问/冲突检测(CSMA/CD)访问方式、令牌总线访问方式、令牌环访问方式、时间分段访问方式和查询访问方式。