The correct answer is that DHCP relay information is trusted on GigabitEthernet0/1, so option 82 packets are accepted on that interface. This is because the show ip dhcp relay information trusted command reveals the per-interface trust status for DHCP relay agent information, specifically option 82. When an interface is marked as "Yes" under the Trusted column, the router will accept and forward incoming DHCP packets that already contain option 82 data from that interface, while a "No" status means such packets are dropped to prevent spoofing. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of DHCP snooping and relay security, often appearing in troubleshooting scenarios where misconfigured trust boundaries cause DHCP failures. A common trap is assuming all interfaces are trusted by default—they are not, and only explicitly trusted interfaces accept pre-existing option 82 information. Memory tip: think of "Trusted = Accepts Tags" or simply "T = A-T" to recall that a trusted interface allows option 82 packets through.
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command on Router R1:
R1# show ip dhcp relay information trusted
Interface Trusted
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 option 82.
Related concept
Read the scenario before looking for a memorised answer.
✗
DHCP relay information is trusted on both interfaces.
Why it's wrong here
GigabitEthernet0/2 is not trusted.
✗
DHCP relay information is not configured on any interface.
Why it's wrong here
The output shows trust settings.
✗
DHCP relay information is trusted on GigabitEthernet0/2, so option 82 packets are dropped.
Why it's wrong here
Untrusted interfaces drop option 82.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
The output shows trust settings.
Detailed technical explanation
How to think about this question
DHCP option 82 (Relay Agent Information) is used to prevent rogue DHCP servers and to provide additional location information. When an interface is configured as 'trusted' (via 'ip dhcp relay information trusted'), the router forwards DHCP packets that already contain option 82 without stripping or modifying them. On untrusted interfaces, the router drops incoming DHCP packets that contain option 82, which helps mitigate DHCP spoofing attacks. This behavior is defined in RFC 3046.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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