[单选题]路由器下，由一般用户模式进入特权用户模式的命令是：（）

正确答案 ：A

enable

[单选题]为了连接“帧中继”线路，网络中的路由器需要提供的端口类型为（）

正确答案 ：B

Serial

[多选题]The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.Which of the following are layer 1 devices that you can use? (Choose all that apply.)

正确答案 ：DE

A hub

A repeater

解析：解析：Explanation:

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