- A
The DHCP guard policy is applied to the interface, and the snooping database is stored in NVRAM.
Both commands are independent; the guard policy filters DHCP, and the database stores bindings.
- B
The DHCP guard policy is applied only if the snooping database is present.
Why wrong: The guard policy works independently of the database file.
- C
The interface will not forward any DHCP messages until the database is populated.
Why wrong: The guard policy operates regardless of the database.
- D
The snooping database is used to validate DHCP server messages.
Why wrong: The database stores bindings, but validation is done by the guard policy.
Question 1,400 of 2,152
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An engineer applies the following configuration to an interface:
interface GigabitEthernet0/5
ipv6 dhcp guard attach-policy DHCP_GUARD ipv6 snooping database file nvram:ipv6-snoop.db
Which statement is true?
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 DHCP guard policy is applied to the interface, and the snooping database is stored in NVRAM.
Option A is correct because the 'ipv6 dhcp guard attach-policy DHCP_GUARD' command applies the DHCP Guard policy to the interface, and the 'ipv6 snooping database file nvram:ipv6-snoop.db' command configures the snooping database to be stored in NVRAM. These two commands operate independently; the DHCP Guard policy is enforced immediately upon attachment, regardless of the database's presence or population state.
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.
- ✓
The DHCP guard policy is applied to the interface, and the snooping database is stored in NVRAM.
Why this is correct
Both commands are independent; the guard policy filters DHCP, and the database stores bindings.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The DHCP guard policy is applied only if the snooping database is present.
Why it's wrong here
The guard policy works independently of the database file.
- ✗
The interface will not forward any DHCP messages until the database is populated.
Why it's wrong here
The guard policy operates regardless of the database.
- ✗
The snooping database is used to validate DHCP server messages.
Why it's wrong here
The database stores bindings, but validation is done by the guard policy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the independence of First Hop Security features; the trap here is assuming that the snooping database must be present or populated for DHCP Guard to function, when in fact DHCP Guard operates based on the policy configuration alone.
Detailed technical explanation
How to think about this question
IPv6 DHCP Guard is a First Hop Security feature that filters DHCPv6 messages based on a policy, typically to block unauthorized DHCP servers. The IPv6 snooping database stores binding information (MAC, IPv6 address, VLAN, interface) learned via ND and DHCP snooping, which can be used for other features like IPv6 Source Guard or to recover entries after a reload. The database file is written to NVRAM for persistence, but its presence or content does not affect DHCP Guard enforcement.
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.
Visual reference
What to study next
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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: The DHCP guard policy is applied to the interface, and the snooping database is stored in NVRAM. — Option A is correct because the 'ipv6 dhcp guard attach-policy DHCP_GUARD' command applies the DHCP Guard policy to the interface, and the 'ipv6 snooping database file nvram:ipv6-snoop.db' command configures the snooping database to be stored in NVRAM. These two commands operate independently; the DHCP Guard policy is enforced immediately upon attachment, regardless of the database's presence or population state.
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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Last reviewed: Jul 4, 2026
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