【说明】
某公司现有网络拓扑结构如图1-1所示。该网络中使用的交换机SW1为三层交换机，SW2和SW3均为二层智能交换机。
【问题3】（4分）
若内网用户IP地址的分配方式为自动分配，在设备R1上启用DHCP功能，并配置内网用户地址池，则需要在用户网关接口下启用的功能是（7）。由于R1缺少到内网网段的相关路由，只有路由配置正确内网用户才可以正常获取到从R1分配出来的IP地址相关信息和访问互联网，以下关于路由配置的叙述错误的是（8）。
（7）备选答案：
A. dhcp中继 B.arp代理 C. dhcp snooping enable
（8）备选答案：
A．SW1需要配置一条默认路由，下一跳指向R1的内网接口地址
B．R1需要配置回程路由，目的IP段为内网网段，下一跳指向与SW1的互联地址
C．R1需要配置缺省路由，下一跳指向ISP的默认网关
D．该网络结构中SW1和R1之间无法使用动态路由实现路由互通
正确答案及解析
正确答案
解析
（7）A
（8）D
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