200-301 · Question #714
Where does the configuration reside when a helper address is configured to support DHCP ?
The correct answer is B. on the router closest to the client.. A DHCP helper address is configured on the router interface that serves as the default gateway for the clients needing DHCP services.
Question
Options
- Aon the switch trunk interface.
- Bon the router closest to the client.
- Con the router closest to the server.
- Don every router along the path.
How the community answered
(37 responses)- A3% (1)
- B95% (35)
- C3% (1)
Why each option
A DHCP helper address is configured on the router interface that serves as the default gateway for the clients needing DHCP services.
Switch trunk interfaces are primarily for carrying multiple VLANs and don't typically host DHCP helper addresses.
The DHCP helper address, or IP helper-address, is configured on the interface of the router that acts as the default gateway for the clients, allowing it to forward DHCP broadcast requests as unicast to the DHCP server.
Configuring the helper address on the router closest to the server would be too late as the client's broadcast would not reach that router.
Configuring it on every router is unnecessary and incorrect; only the router acting as the client's gateway needs this configuration.
Concept tested: DHCP helper address placement
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/xe-3s/dhcp-xe-3s-book/dhcp-relay-agent.html
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