集线器与网桥的区别是( )。
- A.集线器不能检测发送冲突,而网桥可以检测冲突
- B.集线器是物理层设备,而网桥是数据链路层设备
- C.网桥只有两介端口,而集线器是一种多端口网桥
- D.网桥是物理层设备,而集线器是数据链路层设备
正确答案及解析
正确答案
解析
使用集线器的以太网在逻辑上是一个总线网,各站点共享逻辑上的总线,使用的还是CSMA/CD协议。工作在物理层,在集线器中不进行冲突监测,冲突监测只发生在站点,如果两个接口同时又信号输入,那么所有的接口都不能收到正确的帧。集线器是整个一个冲突域。网桥也是一样,冲突监测只发生在站点,但冲突域局限于网桥的某个端口。
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