An administrator needs to configure a router so that devices on a local subnet can obtain dynamic network configuration from a DHCP server located on a different subnet. Which command should the administrator apply to the router interface connected to the local subnet to achieve this?
Use ip address dhcp on the interface.
Set up ip dhcp excluded-address on the router.
Configure ip dhcp relay address [server IP address] on the interface.
Apply the command ip helper-address [server IP address] to the interface.
Applying the command ip helper-address [server IP address] to the router's interface enables the router to forward certain UDP broadcasts, including DHCP requests, to the specified server address. This allows DHCP clients on one subnet to receive configurations from a DHCP server on a different subnet.
The command ip address dhcp configures the router interface itself to obtain an IP address via DHCP, which does not assist in relaying DHCP requests from other devices.
While ip dhcp relay address [server IP address] is valid in some Cisco IOS versions and can be used to configure DHCP relay, it is less commonly used and typically applied in global configuration mode rather than on the interface. In most scenarios, ip helper-address is the standard method for setting up DHCP relay on an interface.
The command ip dhcp excluded-address is used to prevent specific IP addresses from being assigned by the router's own DHCP service and does not relate to forwarding DHCP requests to a remote server.
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Cisco CCNA 200-301
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