DHCP Server Configuration: IP Addresses Unassignable to Hosts

Which IP Addresses Should Never be Assignable to Hosts?

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When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two.)



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A. B. C. D. E. F.


When configuring a DHCP (Dynamic Host Configuration Protocol) server, it's important to avoid assigning certain IP addresses to hosts to ensure proper network operation. The two IP addresses that should never be assignable to hosts are:

A. Network or subnetwork IP address: This IP address identifies the network or subnetwork to which the hosts are connected. Assigning it to a host would result in conflicts and errors, as multiple hosts could claim to be the network or subnetwork.

B. Broadcast address on the network: This IP address is used for sending broadcast messages to all hosts on the network. Assigning it to a host would prevent other hosts from receiving important broadcast messages, as the assigned host would consume all broadcast traffic.

C. IP address leased to the LAN: DHCP servers typically lease IP addresses to hosts for a specific period of time, called the lease time. The leased IP address should not be assigned to any other host during this time, to prevent conflicts and ensure that the assigned host remains reachable.

D. IP address used by the interfaces: DHCP servers require an IP address to operate, which is typically assigned to one of the server's interfaces. This IP address should not be assigned to any other host, as it is used for communication between the DHCP server and other devices on the network.

E. Manually assigned address to the clients: If a host has been manually assigned a static IP address, this address should not be included in the DHCP server's address pool. This avoids conflicts between the DHCP-assigned addresses and the manually assigned addresses.

F. Designated IP address to the DHCP server: DHCP servers often require a specific IP address to be assigned to them, which should not be included in the server's address pool. This ensures that the DHCP server is always reachable and can provide IP addresses to other devices on the network.

In summary, network or subnetwork IP addresses and broadcast addresses should never be assigned to hosts, and DHCP servers should avoid assigning IP addresses that are already in use or reserved for other network functions.