阅读以下说明，回答问题1至问题4，将解答填入答题纸对应的解答栏内。
【说明】
某公司上网用户较少（约50台上网机器），因此公司网管申请了公网IP地址（117.112.2.101/30），拟通过NAT方式结合ACL提供公司内部员工上网，公司内网IP地址段为192.168.1.0/24。
该公司的网络拓扑结构如图3-1所示。
【问题1】（5分）
通过命令行接口（CLI）访问路由器有多种模式，请补充完成图3-2中（1）～（5）的相关内容，实现这四种模式的转换。
正确答案及解析
正确答案
解析
1.disable
2.end or ctrl+z
3.接口配置模式
4.exit or end or ctrl+z
5.全局配置模式
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