如果在路由器上的DHCP是禁用的，你会分配不到IP或默认网关。
If DHCP is disabled on the router, you will not be assigned an IP or a default gateway.
请确保子网掩码和默认网关是所有计算机相同。
Make sure that the Subnet Mask and Default Gateway are the same for all computers.
默认网关是该子网的广播地址。
B. the default gateway is the broadcast address for this subnet.
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