[单选题]对交换机的描述，正确的是（）

正确答案 ：B

单广播域，多冲突域的设备

[多选题]With regard to Ethernet media access methods, which of the following are true?(Choose all that apply.)

正确答案 ：BC

A device listens and waits until the media is not busy before transmitting.

All devices on an Ethernet segment see data that passes on the network medium.

解析：解析：Explanation:

[单选题]OSI第二层数据封装完成后的名称是：()

正确答案 ：C

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