Cisco CCNA 200-301 Practice Question

To enable DHCP clients in VLAN 10 to obtain IP addresses from a DHCP server on a different subnet, the router interface connected to VLAN 10 must be configured to forward DHCP requests to the DHCP server. This is done using the ip helper-address 192.168.1.254 command on the interface, where 192.168.1.254 is the IP address of the DHCP server. The ip helper-address command tells the router to forward UDP broadcasts, including DHCP requests, to the specified address.

The other options are not appropriate for this configuration:

• ip dhcp relay address 192.168.1.254 is not a valid Cisco IOS command for setting up DHCP relay.
• ip dhcp-server 192.168.1.254 is used to specify the DHCP server for the router's own use, not for relaying client requests.
• dhcp relay 192.168.1.254 is incomplete and not a valid command in Cisco IOS.

Therefore, ip helper-address 192.168.1.254 is the correct command to configure the router to forward DHCP requests from VLAN 10 to the DHCP server.