- A
It specifies whether the interface is a server, client, or relay for DHCP filtering.
The role dictates the expected DHCP message types on that interface.
- B
It sets the trust level for ND inspection.
Why wrong: That is for ND inspection, not DHCP guard.
- C
It defines the VLAN membership for the interface.
Why wrong: VLAN membership is configured separately.
- D
It enables IPv6 routing on the interface.
Why wrong: IPv6 routing is enabled with 'ipv6 unicast-routing'.
Question 1,712 of 2,152
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
In IPv6 First Hop Security, what is the purpose of the 'device-role' command in a DHCP guard policy?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
It specifies whether the interface is a server, client, or relay for DHCP filtering.
The 'device-role' command in a DHCP guard policy specifies the role of the interface as either a DHCP server, client, or relay. This allows the switch to filter DHCP messages based on the expected role, blocking unauthorized DHCP server messages on interfaces that should only have clients or relays. It is a key component of IPv6 First Hop Security to prevent rogue DHCPv6 servers.
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.
- ✓
It specifies whether the interface is a server, client, or relay for DHCP filtering.
Why this is correct
The role dictates the expected DHCP message types on that interface.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It sets the trust level for ND inspection.
Why it's wrong here
That is for ND inspection, not DHCP guard.
- ✗
It defines the VLAN membership for the interface.
Why it's wrong here
VLAN membership is configured separately.
- ✗
It enables IPv6 routing on the interface.
Why it's wrong here
IPv6 routing is enabled with 'ipv6 unicast-routing'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between DHCP guard and other First Hop Security features like RA guard or ND inspection, so candidates may confuse the 'device-role' command with trust settings for ND or RA messages.
Detailed technical explanation
How to think about this question
Under the hood, the DHCP guard policy inspects DHCPv6 messages at Layer 2, comparing the source MAC address and message type against the configured device role. For example, if an interface is set to 'client', any DHCPv6 ADVERTISE or REPLY message received on that interface is dropped, preventing rogue server attacks. In a real-world scenario, this is critical in campus networks where unauthorized devices might attempt to act as DHCPv6 servers, causing address conflicts or man-in-the-middle attacks.
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 help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 First Hop Security — This question tests IPv6 First Hop Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It specifies whether the interface is a server, client, or relay for DHCP filtering. — The 'device-role' command in a DHCP guard policy specifies the role of the interface as either a DHCP server, client, or relay. This allows the switch to filter DHCP messages based on the expected role, blocking unauthorized DHCP server messages on interfaces that should only have clients or relays. It is a key component of IPv6 First Hop Security to prevent rogue DHCPv6 servers.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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