[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]The Ezonexam network administrator needs to a switch named VE1 to become the root bridge for a redundant path switched network. What can be done to ensure that VE1 will always assume the role as the root bridge?

正确答案 ：D

Configure the switch so that it has lower priority than other switches in the network

[单选题]查看路由表的命令是：()

正确答案 ：C

show ip route

[单选题]命令“ping127.0.0.1”的功能是（）

正确答案 ：C

测试TCP/IP协议是否正常

[单选题]How many usable IP addresses can you get from a conventional Class C address?

正确答案 ：C

254

解析：解析：Explanation:

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