- A
Device tracking shows two devices in ACTIVE state and one in VERIFY state, indicating ongoing ND verification for the third device.
The VERIFY state means the device is being validated before becoming active.
- B
All devices are in ACTIVE state, indicating stable tracking.
Why wrong: One device is in VERIFY state, not active.
- C
Device tracking is disabled, and the database is empty.
Why wrong: The database has three entries, so it is not empty.
- D
Device tracking only tracks IPv4 addresses.
Why wrong: The output shows IPv6 addresses, so it tracks IPv6.
Question 508 of 2,152
Interpreting Device Tracking Database: ACTIVE, VERIFY, and Policy
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
Fa0/0 0011.2233.4455 10 2001:db8::1 ACTIVE 10 TRUSTED Fa0/0 00aa.bbcc.ddee 10 2001:db8::2 ACTIVE 5 INSPECT Fa0/0 1111.2222.3333 10 2001:db8::3 VERIFY 0 -
What does this output indicate?
Quick Answer
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.
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 shows two devices in ACTIVE state and one in VERIFY state, indicating ongoing ND verification for the third device.
The output shows three entries: two in ACTIVE state (indicating successful ND verification) and one in VERIFY state (meaning the device is currently undergoing Neighbor Discovery verification). The VERIFY state with age 0 indicates that the device has been recently discovered and is being validated before transitioning to ACTIVE. This confirms that device tracking is actively monitoring IPv6 devices, with ongoing ND verification for the third device.
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 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
Read the scenario before looking for a memorised answer.
- ✗
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: answer the scenario, not the keyword
Cisco often tests the distinction between ACTIVE and VERIFY states in IPv6 device tracking, where candidates mistakenly assume all entries are stable (ACTIVE) or that VERIFY indicates a failure, rather than recognizing it as a normal transitional state during ND verification.
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
The VERIFY state in IPv6 device tracking is part of the ND (Neighbor Discovery) snooping process, where the device sends an NS (Neighbor Solicitation) message to confirm the host's reachability before marking it as ACTIVE. This mechanism is defined in RFC 4861 and is crucial for preventing ND spoofing attacks in first-hop security. In real-world scenarios, a device in VERIFY state for an extended period may indicate a rogue device or a misconfigured host that fails to respond to NS probes.
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
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
What to study next
Got this wrong? Here's your next step.
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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 shows two devices in ACTIVE state and one in VERIFY state, indicating ongoing ND verification for the third device. — The output shows three entries: two in ACTIVE state (indicating successful ND verification) and one in VERIFY state (meaning the device is currently undergoing Neighbor Discovery verification). The VERIFY state with age 0 indicates that the device has been recently discovered and is being validated before transitioning to ACTIVE. This confirms that device tracking is actively monitoring IPv6 devices, with ongoing ND verification for the third device.
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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