CCNA: Cisco Certified Network Associate — Question 705

The clients and DHCP server reside on different subnets. Which command must be used to forward requests and replies between clients on the 10.10.0.1/24 subnet and the DHCP server at 192.168.10.1?

Answer options

• A. ip route 192.168.10.1
• B. ip dhcp address 192.168.10.1
• C. ip default-gateway 192.168.10.1
• D. ip helper-address 192.168.10.1

Correct answer: D

Explanation

The correct command is 'ip helper-address 192.168.10.1', which enables the router to forward DHCP requests to the specified server on a different subnet. The other options do not facilitate DHCP request forwarding; 'ip route' sets static routes, 'ip dhcp address' configures an address pool, and 'ip default-gateway' specifies the default gateway for the device, none of which achieve the required functionality.