easyMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip dhcp relay information trusted Interface Trusted
GigabitEthernet0/1 Yes GigabitEthernet0/2 No
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the misconception that 'trusted' means the interface is trusted to send DHCP requests, when in fact it means the interface is trusted to receive and forward packets that already contain option 82 information.
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
✓
DHCP relay information is trusted on GigabitEthernet0/1, so option 82 packets are accepted on that interface.
The command 'show ip dhcp relay information trusted' displays the trust status of each interface for DHCP relay information (option 82). When an interface is marked as 'Yes' under the Trusted column, it means the router will accept and forward DHCP packets that already contain option 82 information from that interface. Therefore, on GigabitEthernet0/1, option 82 packets are accepted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DHCP relay information is trusted on GigabitEthernet0/1, so option 82 packets are accepted on that interface.
Why this is correct
Trusted interfaces accept DHCP packets carrying option 82 relay agent information; untrusted ones discard them. GigabitEthernet0/1 shows Trusted Yes, so option 82 packets arriving there are accepted and forwarded, satisfying the stem's requirement. GigabitEthernet0/2, marked No, would drop such packets instead.
- ✗
DHCP relay information is trusted on both interfaces.
Why it's wrong here
The output lists GigabitEthernet0/1 as Trusted Yes and GigabitEthernet0/2 as Trusted No, so trust is enabled on only one interface. The option is tempting because both interfaces appear in the same table, but the per-interface Trusted column is the deciding value, not the command's presence.
- ✗
DHCP relay information is not configured on any interface.
Why it's wrong here
The output explicitly lists GigabitEthernet0/1 as trusted, so relay information is configured there; the command would return nothing if unconfigured anywhere. It tempts because "No" on GigabitEthernet0/2 suggests absence, but that value means untrusted, not unconfigured — the option would be right only if both interfaces showed no trust state at all.
- ✗
DHCP relay information is trusted on GigabitEthernet0/2, so option 82 packets are dropped.
Why it's wrong here
GigabitEthernet0/2 shows "No", meaning the interface is untrusted, so relay-agent information (option 82) is stripped or dropped there, not trusted. The option reverses the output. Trusting an interface is configured where a genuine relay agent connects, permitting option 82 to pass unchanged.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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