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二、以发送邮件为例展示域名解析过程和 IP 路由通信的过程 从下面各项中选择填写(只填写序号): 1. 客户机设置 DNS 服务器地址 106.17.22.1 2. 输入收件人电子邮箱和内容 3. DNS 服务器, bit.edu.cn à 209.113.21.1 4. 路由器 N , 10.7.1.0 对应的下一跳地址为 112.12.18.3 路由器 A 5. 路由器 A , 106.17.22.0 对应的下一跳地址为 112.12.18.2 路由器 N 6. 路由器 N ,设置路由表, 106.17.22.0 , 255.255.255.0 , 106.17.22.1 7. 路由器 A , 10.7.1.0 对应的下一跳地址为 10.7.1.6 从下面各项中选择填写(只填写序号): 1. 路由器 A ,设置路由表, 209.113.21.1 对应的下一跳地址为 11.45.2.4 路由器 B 2. 路由器 A ,设置路由表, 209.113.21.0 对应的下一跳地址为 11.45.2.5 路由器 B 3. 路由器 B , 209.113.21.0 对应的下一跳地址为 21.22.1.7 路由器 D 4. 路由器 B , 209.113.21.1 对应的下一跳地址为 21.22.1.5 路由器 D 5. 路由器 D , 209.113.21.1 对应的下一跳地址为 209.113.21.6 邮件服务器 6. 路由器 D , 209.113.21.0 对应的下一跳地址为 209.113.21.1 邮件服务器 7. 邮件服务器成功接收邮件
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