[单选题]OSI七层模型中，“段”是哪一层数据封装的名称（）

正确答案 ：D

传输层

[单选题]An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up.What does "line protocol is up" specifically indicate about the interface?

正确答案 ：C

Keepalives are being received on the interface.

解析：解析：Explanation:

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