一个运行CSMA/CD协议的以太网，数据速率为1Gb/s，网段长1km，信号速率为200，000km/sec，则最小帧长是（ ）比特。
- A.1000
- B.2000
- C.10000
- D.200000
正确答案及解析
正确答案
解析
在CSMA/CD机制中，检测冲突所需要的最长时间是网络传输延迟的2倍，此时间可以用bit位数来表示，称之为“冲突窗口”。为了保证在信息发送完成之前能够检测到冲突，发送时间应该大于等于冲突窗口，即规定最小的帧长等于2×（网络数据速率×最大段长）/信号传播速率，所以针对题干的描述，最小帧长是2×（109×1/200000）=10000bits。
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