[单选题]帧中继环境中，在物理端口上，建立子接口的命令是（）

正确答案 ：B

interface

[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:

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