Question 1,298 of 2,152

IPv6 First Hop Security →hardMultiple SelectObjective-mapped

300-410 IPv6 First Hop Security Practice Question

This 300-410 practice question tests your understanding of ipv6 first hop security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 statements about IPv6 First Hop Security (FHS) Device Tracking are true? (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
Device Tracking uses Neighbor Discovery (ND) probes to determine if a host is still reachable.
Correct. Device Tracking sends ND probes to verify host reachability and updates the binding table accordingly.
B
Device Tracking relies on DHCPv6 lease expiration to remove stale bindings.
Why wrong: Incorrect. Device Tracking uses active probes, not DHCPv6 lease times, to determine host presence.
C
Device Tracking creates binding entries for hosts that are discovered via ND.
Why wrong: Incorrect. Device Tracking does not create bindings; it only tracks the state of existing bindings.
D
Device Tracking can be enabled on a per-interface basis using the 'ipv6 device-track' command.
Correct. The 'ipv6 device-track' command enables Device Tracking on a specific interface.
E
Device Tracking only supports IPv6 hosts.
Why wrong: Incorrect. Device Tracking supports both IPv4 and IPv6 hosts, using ARP and ND probes respectively.

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

✓

Device Tracking uses Neighbor Discovery (ND) probes to determine if a host is still reachable.

Option A is correct because Device Tracking uses Neighbor Discovery (ND) probes (e.g., Neighbor Solicitations) to actively verify whether a host is still reachable on the link. This mechanism allows the switch to detect host movement or disconnection and update its binding table accordingly, ensuring that security features like RA Guard and DHCP Guard apply to the correct host 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.

✓
Device Tracking uses Neighbor Discovery (ND) probes to determine if a host is still reachable.
Why this is correct
Correct. Device Tracking sends ND probes to verify host reachability and updates the binding table accordingly.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Device Tracking relies on DHCPv6 lease expiration to remove stale bindings.
Why it's wrong here
Incorrect. Device Tracking uses active probes, not DHCPv6 lease times, to determine host presence.
✗
Device Tracking creates binding entries for hosts that are discovered via ND.
Why it's wrong here
Incorrect. Device Tracking does not create bindings; it only tracks the state of existing bindings.
✓
Device Tracking can be enabled on a per-interface basis using the 'ipv6 device-track' command.
Why this is correct
Correct. The 'ipv6 device-track' command enables Device Tracking on a specific 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.
✗
Device Tracking only supports IPv6 hosts.
Why it's wrong here
Incorrect. Device Tracking supports both IPv4 and IPv6 hosts, using ARP and ND probes respectively.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the misconception that Device Tracking only works with IPv6, when in fact it supports both IPv6 and IPv4 hosts, and the 'ipv6 device-track' command is simply the interface-level enablement for IPv6 tracking.

Detailed technical explanation

How to think about this question

Device Tracking maintains a binding table that includes the host's MAC address, IPv6 address, VLAN, and interface. It uses configurable inactivity timers and sends ND Neighbor Solicitations (or ARP probes for IPv4) to confirm reachability; if no response is received after a set number of retries, the binding is marked as stale or removed. In a real-world scenario, this is critical for preventing neighbor cache poisoning in large enterprise networks where hosts frequently roam between access switches.

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.

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: Device Tracking uses Neighbor Discovery (ND) probes to determine if a host is still reachable. — Option A is correct because Device Tracking uses Neighbor Discovery (ND) probes (e.g., Neighbor Solicitations) to actively verify whether a host is still reachable on the link. This mechanism allows the switch to detect host movement or disconnection and update its binding table accordingly, ensuring that security features like RA Guard and DHCP Guard apply to the correct host 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.

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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