After the DHCP server is configured, the DHCP server address pool will automatically assign an IP address. If the address pool IP address is allocated, the host will not obtain an IP address. When the host cannot communicate with the DHCP server, the Windows system automatically allocates a 169.254 .0.0 / 24 address. When a better DHCP server exists on the network, a more efficient DHCP server is preferentially used for IP address allocation.