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.
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?
RA Guard
Why wrong: RA Guard does not maintain a device tracking database; it filters RAs.
DHCPv6 Guard
Why wrong: DHCPv6 Guard filters DHCPv6 messages and does not maintain a device tracking database.
Device Tracking
Correct. Device Tracking maintains a database of IPv6 addresses and their reachability.
PACL
Why wrong: PACL (Port ACL) is not a specific IPv6 FHS feature; it is a general ACL applied to a port.
Answer choices
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 an IPv6 FHS feature that maintains a database of IPv6 addresses and their reachability status on a per-interface basis. It is used by other FHS features like ND Snooping and Source Guard.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
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
Standard ACLs match source addresses.
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
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
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.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
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FAQ
IPv6 First Hop Security — This question tests IPv6 First Hop Security — Standard ACLs match source addresses..
The correct answer is: Device Tracking — Device Tracking is an IPv6 FHS feature that maintains a database of IPv6 addresses and their reachability status on a per-interface basis. It is used by other FHS features like ND Snooping and Source Guard.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 2026
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