A DHCP server is at 172.16.32.15. For clients on 192.168.52.0/24 to reach the server, what command is required on the client subnet router?
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Correct answer: ip helper-address 172.16.32.15.
Why this is the answer
The ip helper-address command is essential because DHCP uses broadcast messages (UDP ports 67 and 68) for client-server communication. Routers, by default, do not forward broadcast traffic between different subnets. By configuring ip helper-address 172.16.32.15 on the interface of the router connected to the 192.168.52.0/24 subnet, the router converts the client's DHCP broadcast requests into unicast messages and forwards them to the specified DHCP server at 172.16.32.15. ip default-gateway and ip default-network are used for routing decisions on end devices or for advertising default routes, not for forwarding DHCP requests. ip forward-protocol udp 137 is for NetBIOS Name Service (NBNS) broadcasts, not DHCP.
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