mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify DHCPv6 guard…
A network engineer runs the following command to verify DHCPv6 guard policy:
R1# show ipv6 dhcp guard policy DHCP-POLICY
Policy: DHCP-POLICY Status: Active Device role: dhcp-client Trusted ports: none Untrusted ports: Fa0/0 DHCPv6 guard: enabled DHCPv6 guard action: block DHCPv6 server validation: enabled DHCPv6 server list: 2001:db8::10
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between the 'device role' (dhcp-client vs. dhcp-server) and the filtering direction; the trap here is assuming that 'dhcp-client' role means the policy filters client messages, when in fact it filters server messages on that port to protect clients from rogue servers.
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 policy blocks DHCPv6 server messages on Fa0/0 except from server 2001:db8::10.
The output shows that DHCPv6 guard is enabled with an action of 'block' on untrusted port Fa0/0, and DHCPv6 server validation is enabled with a server list containing 2001:db8::10. This means the policy blocks DHCPv6 server messages (e.g., ADVERTISE, REPLY) received on Fa0/0, but allows them if they originate from the specified server address. Thus, only server messages from 2001:db8::10 are permitted, while all other DHCPv6 server messages are blocked.
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 policy blocks DHCPv6 server messages on Fa0/0 except from server 2001:db8::10.
Why this is correct
The action is block, and server validation is enabled with a specific server list.
- ✗
The policy allows all DHCPv6 messages on Fa0/0 without any filtering.
Why it's wrong here
The action is block, not allow.
- ✗
The policy only applies to DHCPv6 client messages and ignores server messages.
Why it's wrong here
The policy blocks server messages, as indicated by server validation.
- ✗
The policy is inactive and not applied to any interface.
Why it's wrong here
Status is Active, and Fa0/0 is listed as an untrusted port.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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