A network administrator needs to allow devices on VLAN 10 to automatically obtain their network settings from a server located on a different subnet. The devices are connected to a Cisco router. Which command should the administrator apply to the interface connected to VLAN 10 to enable this functionality?
To enable devices on VLAN 10 to obtain their IP configurations from a DHCP server on a different subnet, the correct command is ip helper-address [DHCP server IP address] applied to the router interface connected to VLAN 10. This command configures the router to forward DHCP broadcasts (and certain other UDP broadcasts) to the specified IP address, effectively acting as a DHCP relay agent. The other options are incorrect because they either refer to non-existent commands or do not perform the DHCP relay function. For example, ip dhcp relay-address and ip dhcp-server are not valid Cisco IOS commands in this context, and ip relay does not exist.
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Cisco CCNA 200-301
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