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IPv6 First Hop Security →mediumMultiple SelectObjective-mapped

300-410 IPv6 First Hop Security Practice Question

This 300-410 practice question tests your understanding of ipv6 first hop security. 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.

Which TWO commands can be used to verify the operation of IPv6 First Hop Security features such as RA Guard and DHCPv6 Guard on a Cisco IOS-XE switch? (Choose TWO.)

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
show ipv6 snooping
This command displays the operational status of IPv6 snooping features, including RA Guard and DHCPv6 Guard, and is a primary verification tool.
B
show ipv6 dhcp guard
This command shows the DHCPv6 Guard configuration and statistics, confirming whether the feature is active and blocking unauthorized DHCP servers.
C
show ipv6 nd raguard
Why wrong: This is not a valid Cisco IOS command; the correct command to verify RA Guard is 'show ipv6 snooping' or 'show ipv6 nd raguard policy' (with policy name), but not standalone.
D
show ipv6 dhcp binding
Why wrong: This command shows DHCPv6 client bindings, not the guard feature itself; it is used for DHCPv6 server verification, not FHS.
E
show ipv6 source guard
Why wrong: This command is used for IPv6 Source Guard, which is a separate FHS feature; it does not verify RA Guard or DHCPv6 Guard.

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

✓

show ipv6 snooping

Option A is correct because the 'show ipv6 snooping' command is the primary verification tool for IPv6 First Hop Security (FHS) features, including RA Guard and DHCPv6 Guard. It displays the IPv6 snooping policy database, which tracks all discovered IPv6 neighbors and their binding states, directly reflecting the operational status of RA Guard and DHCPv6 Guard enforcement on the switch.

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.

✓
show ipv6 snooping
Why this is correct
This command displays the operational status of IPv6 snooping features, including RA Guard and DHCPv6 Guard, and is a primary verification tool.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
show ipv6 dhcp guard
Why this is correct
This command shows the DHCPv6 Guard configuration and statistics, confirming whether the feature is active and blocking unauthorized DHCP servers.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
show ipv6 nd raguard
Why it's wrong here
This is not a valid Cisco IOS command; the correct command to verify RA Guard is 'show ipv6 snooping' or 'show ipv6 nd raguard policy' (with policy name), but not standalone.
✗
show ipv6 dhcp binding
Why it's wrong here
This command shows DHCPv6 client bindings, not the guard feature itself; it is used for DHCPv6 server verification, not FHS.
✗
show ipv6 source guard
Why it's wrong here
This command is used for IPv6 Source Guard, which is a separate FHS feature; it does not verify RA Guard or DHCPv6 Guard.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between the generic 'show ipv6 snooping' command and the specific but non-existent 'show ipv6 nd raguard' command, leading candidates to incorrectly assume each FHS feature has its own dedicated show command.

Trap categories for this question

Command / output trap
This is not a valid Cisco IOS command; the correct command to verify RA Guard is 'show ipv6 snooping' or 'show ipv6 nd raguard policy' (with policy name), but not standalone.

Detailed technical explanation

How to think about this question

IPv6 FHS features like RA Guard and DHCPv6 Guard rely on the IPv6 snooping database, which is built by intercepting Neighbor Discovery (ND) and DHCPv6 messages. The 'show ipv6 snooping' command reveals the binding table entries, including the port, VLAN, MAC address, and IPv6 address, along with the policy name applied (e.g., raguard or dhcpguard). In a real-world scenario, if a rogue RA is detected on an untrusted port, the switch will log a violation and the snooping database will show the port as 'blocked' or 'shutdown' depending on the configured action.

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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

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: show ipv6 snooping — Option A is correct because the 'show ipv6 snooping' command is the primary verification tool for IPv6 First Hop Security (FHS) features, including RA Guard and DHCPv6 Guard. It displays the IPv6 snooping policy database, which tracks all discovered IPv6 neighbors and their binding states, directly reflecting the operational status of RA Guard and DHCPv6 Guard enforcement on the switch.

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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