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?
All entries are in the ACTIVE state, meaning they are valid bindings.
ACTIVE state indicates the binding is valid and being used.
The binding for 2001:DB8:1::103 is invalid.
Why wrong: It is ACTIVE, so it is valid.
The table shows only IPv6 addresses from SLAAC.
Why wrong: The binding table can include DHCPv6 and static entries as well.
There are no entries for VLAN 10.
Why wrong: All entries are in VLAN 10.
Answer choices
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 snooping binding table shows the IPv6 addresses and corresponding MAC addresses for devices on VLAN 10. All entries are ACTIVE, meaning they have been validated. This is used for source guard and other first-hop security features.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
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
Authentication checks who the user is.
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
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
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.
What to study next
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 300-410 questions on access control and AAA configuration.
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FAQ
IPv6 First Hop Security — This question tests IPv6 First Hop Security — Authentication checks who the user is..
The correct answer is: All entries are in the ACTIVE state, meaning they are valid bindings. — The snooping binding table shows the IPv6 addresses and corresponding MAC addresses for devices on VLAN 10. All entries are ACTIVE, meaning they have been validated. This is used for source guard and other first-hop security features.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 300-410 questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 18, 2026
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