- A
All entries are in the ACTIVE state, meaning they are valid bindings.
ACTIVE state indicates the binding is valid and being used.
- B
The binding for 2001:DB8:1::103 is invalid.
Why wrong: It is ACTIVE, so it is valid.
- C
The table shows only IPv6 addresses from SLAAC.
Why wrong: The binding table can include DHCPv6 and static entries as well.
- D
There are no entries for VLAN 10.
Why wrong: All entries are in VLAN 10.
Question 1,152 of 2,152
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 on Router R1:
R1# show ipv6 snooping binding
IPv6 Address MAC Address VLAN Interface State 2001:DB8:1::100 aaaa.bbbb.cccc 10 Gi0/0/0 ACTIVE 2001:DB8:1::101 aaaa.bbbb.cccd 10 Gi0/0/0 ACTIVE 2001:DB8:1::102 aaaa.bbbb.ccce 10 Gi0/0/1 ACTIVE 2001:DB8:1::103 aaaa.bbbb.cccf 10 Gi0/0/1 ACTIVE
Based on this output, which statement is correct?
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
✓
All entries are in the ACTIVE state, meaning they are valid bindings.
The ACTIVE state in IPv6 snooping binding indicates that the binding has been validated and is currently in use, meaning the IPv6 address, MAC address, VLAN, and interface combination is legitimate. Option A is correct because all four entries show ACTIVE, confirming they are valid bindings that have passed the First Hop Security (FHS) validation process, such as Duplicate Address Detection (DAD) or neighbor solicitation verification.
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.
- ✓
All entries are in the ACTIVE state, meaning they are valid bindings.
Why this is correct
ACTIVE state indicates the binding is valid and being used.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The binding for 2001:DB8:1::103 is invalid.
Why it's wrong here
It is ACTIVE, so it is valid.
- ✗
The table shows only IPv6 addresses from SLAAC.
Why it's wrong here
The binding table can include DHCPv6 and static entries as well.
- ✗
There are no entries for VLAN 10.
Why it's wrong here
All entries are in VLAN 10.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that all ACTIVE entries are automatically valid without understanding that ACTIVE simply means the binding passed initial validation, but it does not guarantee the device is not malicious if the binding was spoofed before FHS was enabled.
Detailed technical explanation
How to think about this question
IPv6 snooping binding is part of IPv6 First Hop Security (FHS) and relies on the Neighbor Discovery Protocol (NDP) to build a binding table that maps IPv6 addresses to MAC addresses, preventing attacks like Neighbor Advertisement spoofing. The ACTIVE state means the binding has been verified through mechanisms like Duplicate Address Detection (RFC 4862) or is learned via DHCPv6 (RFC 8415), and it is actively used for forwarding decisions. In a real-world scenario, an engineer might use this command to troubleshoot connectivity issues, ensuring that only trusted devices are allowed to communicate on the VLAN.
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
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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: All entries are in the ACTIVE state, meaning they are valid bindings. — The ACTIVE state in IPv6 snooping binding indicates that the binding has been validated and is currently in use, meaning the IPv6 address, MAC address, VLAN, and interface combination is legitimate. Option A is correct because all four entries show ACTIVE, confirming they are valid bindings that have passed the First Hop Security (FHS) validation process, such as Duplicate Address Detection (DAD) or neighbor solicitation verification.
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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