选择题 5.  某Linux DHCP服务器dhcpd.conf的配置文件如下：
    ddns-updae-style none;
    subnet 192.168.0.0 netmask 255.255.255.0{
    range 192.168.0.200 192.168.0.254;
    ignore client-updates;
    default-lease-time 3600;
    max-lease-time 7200;
    option routers 192.168.0.1;
    option domain-name "test.org";
    option domain-name-servers 192.168.0.2;
    }
    host test 1 {hardware ethemet 00:E0:4C:70:33:65;fixed-address 192.168.0.8;)
    客户端IP地址的默认租用期为______小时。