- A
RA Guard
Why wrong: RA Guard does not maintain a device tracking database; it filters RAs.
- B
DHCPv6 Guard
Why wrong: DHCPv6 Guard filters DHCPv6 messages and does not maintain a device tracking database.
- C
Device Tracking
Correct. Device Tracking maintains a database of IPv6 addresses and their reachability.
- D
PACL
Why wrong: PACL (Port ACL) is not a specific IPv6 FHS feature; it is a general ACL applied to a port.
Question 2,088 of 2,152
Device Tracking — IPv6 First Hop Security Feature | Cisco CCNP ENARSI 300-410
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 IPv6 FHS feature uses a 'device tracking' database to maintain reachability information for hosts?
Quick Answer
The answer is Device Tracking. This IPv6 First Hop Security feature is correct because it uses a dedicated device tracking database to maintain per-interface reachability information for IPv6 hosts, recording their addresses and current status. Other FHS features, such as ND Snooping and Source Guard, rely on this database to verify whether a host is actually present before forwarding traffic or applying security policies. On the Cisco CCNP ENARSI 300-410 exam, this concept often appears in questions about the dependency chain among IPv6 FHS features—a common trap is confusing Device Tracking with ND Snooping, but remember that ND Snooping inspects Neighbor Discovery messages, while Device Tracking is the underlying database that tracks host liveness. A useful memory tip: think of Device Tracking as the “phone book” that other FHS features consult to confirm a host is still connected.
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
Device Tracking is the correct answer because it is the IPv6 First Hop Security (FHS) feature that maintains a 'device tracking' database to monitor and store reachability information for hosts. This database tracks the IPv6 address, MAC address, and binding state of each host, enabling features like ND Inspection and DHCPv6 Guard to verify host reachability before forwarding traffic.
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.
- ✗
RA Guard
Why it's wrong here
RA Guard does not maintain a device tracking database; it filters RAs.
- ✗
DHCPv6 Guard
Why it's wrong here
DHCPv6 Guard filters DHCPv6 messages and does not maintain a device tracking database.
- ✓
Device Tracking
Why this is correct
Correct. Device Tracking maintains a database of IPv6 addresses and their reachability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
PACL
Why it's wrong here
PACL (Port ACL) is not a specific IPv6 FHS feature; it is a general ACL applied to a port.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between features that maintain the database (Device Tracking) versus features that use the database (e.g., DHCPv6 Guard, RA Guard), so the trap here is assuming that any FHS feature that interacts with host information must be the one that maintains the tracking database.
Detailed technical explanation
How to think about this question
The device tracking database is built and maintained by the IPv6 Neighbor Discovery (ND) process, which listens for ND messages (NS, NA, RS, RA) and DHCPv6 messages to learn and update host bindings. This database is critical for features like IPv6 First Hop Security (FHS) to enforce policies such as Source Guard and Prefix Guard, and it uses a configurable lifetime (default 300 seconds) to age out stale entries. In a real-world scenario, if a host moves to a different port, the device tracking database detects the change via ND messages and updates the binding, preventing traffic misdirection.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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
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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 — Device Tracking is the correct answer because it is the IPv6 First Hop Security (FHS) feature that maintains a 'device tracking' database to monitor and store reachability information for hosts. This database tracks the IPv6 address, MAC address, and binding state of each host, enabling features like ND Inspection and DHCPv6 Guard to verify host reachability before forwarding traffic.
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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