1. [单选题]路由器下“特权用户模式”的标识符是：()
A. >
B. !
C.
D. (config-if)
2. [单选题]OSI七层模型中，物理层的数据封装名称为（）
A. 比特
B. 帧
C. 包
D. 段
3. [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
A. What is the purpose of this command?
B. It is used to restart the router.
C. It is used to bypass the configuration in NVRAM.
D. It is used to enter ROM Monitor mode.
E. It is used to view the lost password.
F. It is used to save the changes to the configuration.
