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IPv6 First Hop Security →mediumMultiple ChoiceObjective-mapped

300-410 IPv6 First Hop Security Practice Question

This 300-410 practice question tests your understanding of ipv6 first hop security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Which configuration is missing to properly implement IPv6 First Hop Security on an access switch port that should only allow traffic from a single host with a static IPv6 address 2001:db8:1::10?

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.

A
The interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'.
IPv6 Source Guard with a static binding ensures only that source address is allowed.
B
The interface needs 'ipv6 nd raguard' to block RAs.
Why wrong: RA guard blocks RAs, not all traffic from other hosts.
C
The interface needs 'ipv6 dhcp guard' to block DHCP messages.
Why wrong: DHCP guard only filters DHCP, not all IPv6 traffic.
D
The interface needs 'ipv6 nd inspection' to validate ND messages.
Why wrong: ND inspection validates ND, but does not restrict all traffic to a single host.

Full breakdown with real-world context →

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 interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'.

Option A is correct because IPv6 First Hop Security (FHS) on an access switch port requires both the 'ipv6 verify source' command on the interface and a static IPv6 source binding entry to enforce that only traffic from the specified host (2001:db8:1::10) is allowed. The 'ipv6 verify source' command enables source address validation using the binding table, and the static binding entry populates that table with the allowed source address and interface. Without both components, the switch cannot filter traffic based on the static IPv6 address.

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 interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'.
Why this is correct
IPv6 Source Guard with a static binding ensures only that source address is allowed.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The interface needs 'ipv6 nd raguard' to block RAs.
Why it's wrong here
RA guard blocks RAs, not all traffic from other hosts.
✗
The interface needs 'ipv6 dhcp guard' to block DHCP messages.
Why it's wrong here
DHCP guard only filters DHCP, not all IPv6 traffic.
✗
The interface needs 'ipv6 nd inspection' to validate ND messages.
Why it's wrong here
ND inspection validates ND, but does not restrict all traffic to a single host.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the misconception that a single FHS feature (like RA guard, DHCP guard, or ND inspection) is sufficient for source address filtering, when in fact 'ipv6 verify source' combined with a static binding is required to restrict traffic to a specific static IPv6 address.

Detailed technical explanation

How to think about this question

The 'ipv6 verify source' command leverages the IPv6 source guard feature, which consults the IPv6 binding table (populated by DHCPv6 snooping or static entries) to permit or deny traffic based on source IPv6 address and prefix length. A static binding entry (e.g., 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6') creates a permanent entry in the binding table, overriding any dynamic learning. In a real-world scenario, this is critical for securing server or printer ports where the device has a fixed IPv6 address and must not be spoofed by an attacker on the same VLAN.

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

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: The interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'. — Option A is correct because IPv6 First Hop Security (FHS) on an access switch port requires both the 'ipv6 verify source' command on the interface and a static IPv6 source binding entry to enforce that only traffic from the specified host (2001:db8:1::10) is allowed. The 'ipv6 verify source' command enables source address validation using the binding table, and the static binding entry populates that table with the allowed source address and interface. Without both components, the switch cannot filter traffic based on the static IPv6 address.

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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