[单选题]FTP工作在OSI哪一层（）

正确答案 ：D

应用层

[单选题]常见的LSA有几种类型()

正确答案 ：C

6

[单选题]You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:o/r 0x2142

正确答案 ：C

It is used to bypass the configuration in NVRAM.

解析：解析：Explanation:

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