On which device is a DHCP helper address configured to support DHCP?
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Correct answer: on the router closest to the client.
Why this is the answer
A DHCP helper address (or IP helper-address) is configured on the router interface that acts as the default gateway for the client segment. When a client broadcasts a DHCP Discover message, this router receives it and, upon seeing the helper address configured, unicasts the request to the specified DHCP server. This allows DHCP requests to cross subnet boundaries, as broadcasts are normally confined to their local subnet. Configuring it on the router closest to the server is incorrect because that router wouldn't receive the initial client broadcast. Configuring it on every router is unnecessary and inefficient. Configuring it on a switch trunk interface is incorrect because switches operate at Layer 2 and do not typically handle IP helper addresses for routing DHCP requests across subnets.
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