The answer is that the output indicates two devices in the ACTIVE state and one in the VERIFY state, meaning the third device is still undergoing Neighbor Discovery (ND) verification. This is correct because the ACTIVE state confirms the device has passed all security checks and is forwarding traffic, while the VERIFY state means the switch has detected the device but is still performing ND or DHCPv6 snooping validation before granting full access. On the Cisco CCNP ENARSI 300-410 exam, this command tests your understanding of IPv6 First Hop Security features, specifically how device tracking enforces policies like TRUSTED or INSPECT. A common trap is assuming VERIFY indicates a failure—it actually means verification is in progress, and the device will transition to ACTIVE once confirmed. For a memory tip, remember that ACTIVE is "all clear," VERIFY is "waiting for proof," and a missing policy (dash) often means the device is still in the verification phase.
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.
A network engineer runs the following command to verify IPv6 device tracking:
R1# show ipv6 device-tracking database
Interface MAC Address VLAN IPv6 Address State Age Policy
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Device tracking shows two devices in ACTIVE state and one in VERIFY state, indicating ongoing ND verification for the third device.
The show command displays the device tracking database, showing active and verifying states for devices on interface Fa0/0 with associated policies.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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 shows two devices in ACTIVE state and one in VERIFY state, indicating ongoing ND verification for the third device.
Why this is correct
The VERIFY state means the device is being validated before becoming active.
Related concept
Access ports place end devices into a single VLAN.
✗
All devices are in ACTIVE state, indicating stable tracking.
Why it's wrong here
One device is in VERIFY state, not active.
✗
Device tracking is disabled, and the database is empty.
Why it's wrong here
The database has three entries, so it is not empty.
✗
Device tracking only tracks IPv4 addresses.
Why it's wrong here
The output shows IPv6 addresses, so it tracks IPv6.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Trap categories for this question
Command / output trap
The output shows IPv6 addresses, so it tracks IPv6.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 300-410 questions on switching, trunking, and access-port configuration.
IPv6 First Hop Security — This question tests IPv6 First Hop Security — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Device tracking shows two devices in ACTIVE state and one in VERIFY state, indicating ongoing ND verification for the third device. — The show command displays the device tracking database, showing active and verifying states for devices on interface Fa0/0 with associated policies.
What should I do if I get this 300-410 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 300-410 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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