hardMultiple ChoiceObjective-mapped
300-410 Practice Question: A router configured as a DHCPv6 relay agent is…
A router configured as a DHCPv6 relay agent is not forwarding DHCPv6 requests from clients to the server. The relay interface has 'ipv6 dhcp relay destination' configured. Clients are on a different VLAN. Which is the most likely explanation?
⚠ Common exam trap
Cisco often tests the misconception that the relay destination should be placed on the interface facing the DHCP server, when in fact it must be on the interface facing the DHCP clients to intercept their messages.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The relay destination is configured on the client-facing interface; it should be on the server-facing interface.
The 'ipv6 dhcp relay destination' command must be configured on the interface facing the DHCPv6 clients, not the server-facing interface. This command instructs the router to intercept DHCPv6 messages arriving on that interface and forward them as relay-forward messages to the specified DHCPv6 server. Placing it on the server-facing interface would cause the router to attempt relaying on the wrong interface, so client requests on the client-facing VLAN are never intercepted or forwarded.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The relay destination is configured on the client-facing interface; it should be on the server-facing interface.
Why this is correct
Correct: The 'ipv6 dhcp relay destination' command must be applied to the interface that receives client requests (client-facing), not the server-facing interface.
- ✗
The DHCPv6 server is not reachable via the relay agent's routing table.
Why it's wrong here
Incorrect: While this could be an issue, the more common misconfiguration is the interface placement.
- ✗
The relay agent must have 'ipv6 dhcp server' configured to act as a server.
Why it's wrong here
Incorrect: Relay and server functions are separate; a relay does not need server configuration.
- ✗
The clients are using DHCPv4, not DHCPv6.
Why it's wrong here
Incorrect: The configuration is for DHCPv6, but the question states DHCPv6.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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