阅读以下说明，回答问题1～3，将解答填入答题纸的对应栏内。
某公司的网络拓扑结构如图3-1所示。其中的DHCP server安装的Linux系统。
【问题1】（10分）
管理员根据公司的情况，在DHCP 服务器的配置文件是 "dhcpd.conf",具体内容如下：
1 default-lease-time 172800; 2 max-lease-time 259200; 3 option subnet-mask 255.255.255.0; 4 option broadcast-address192.168.1.255; 5 option router 192.168.1.253; 6 option domain-name-serves192.168.1.1, 192.168.1.2 7 option domain-name “test.com” 8 subnet192.168.1.0 netmask 255.255.255.0 9 { 10 range 192.168.1.100 192 .168.1.200; 11 }
结合公司的网络拓扑结构，上述配置文件中第（1）行配置错误，若要改正配置，通常使用vi (2)这个命令，看到上述内容，将错误的参数修改为（3）。根据这个文件中的内容，该DHCP服务的默认租期是 （4） 天，获得的DNS服务器IP地址为 （5） 。
正确答案及解析
正确答案
解析
（1）5
（2）/etc/dhcpd.conf
（3）192.168.1.1
（4） 2
（5）192.168.1.1, 192.168.1.2 （写出其中一个就正确）
【解析】
从拓扑图可以看到默认网关应该是192.168.1.1，也就是路由器的接口IP地址。租约的默认单位是秒，这里需要换算成天，一天是86400秒。
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