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What are the preassigned up addresses that all networks must have? Example in the network 192.168.0.1 which addresses would the DHCP SERVER not assign?

Well the gateway which is usually the routers address , the loop back address 192.168.0.254' and the broadcast adress 192.168.0.255. These numbers will not always be the same. Depends on your subneting

Another security trick is to tell the dhcp server which ip addresses you want to be the gateway, loop back and router ip adress. The last octet of the adress if I'm not mistaken is always. 255 I may be incorrect .

Explanation

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