- A
It filters IPv6 traffic based on the source IPv6 address of incoming packets.
IPv6 Source Guard checks the source address against the binding table and drops packets with invalid source addresses.
- B
It relies on the IPv6 snooping binding table, which is populated by DHCPv6 snooping or ND Inspection.
The binding table is built from DHCPv6 snooping entries or ND Inspection, and Source Guard uses this table to validate traffic.
- C
It can be configured to allow traffic from specific prefixes using a static prefix list.
A static prefix list can be applied to permit traffic from certain prefixes, overriding dynamic entries.
- D
It filters both incoming and outgoing IPv6 traffic on a port.
Why wrong: IPv6 Source Guard filters only incoming traffic (ingress) to prevent spoofing; it does not filter outgoing traffic.
- E
It requires DHCPv6 snooping to be enabled on the VLAN to function.
Why wrong: While DHCPv6 snooping can populate the binding table, ND Inspection can also be used; DHCPv6 snooping is not strictly required.
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 THREE statements about IPv6 Source Guard are true? (Choose THREE.)
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
It filters IPv6 traffic based on the source IPv6 address of incoming packets.
IPv6 Source Guard filters traffic based on the source address, using the binding table. It prevents spoofing, requires DHCPv6 snooping or ND Inspection to build the table, and can be configured with a static prefix list. The incorrect options misstate the filtering direction or necessity of DHCPv6.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It filters IPv6 traffic based on the source IPv6 address of incoming packets.
Why this is correct
IPv6 Source Guard checks the source address against the binding table and drops packets with invalid source addresses.
Related concept
Access ports place end devices into a single VLAN.
- ✓
It relies on the IPv6 snooping binding table, which is populated by DHCPv6 snooping or ND Inspection.
Why this is correct
The binding table is built from DHCPv6 snooping entries or ND Inspection, and Source Guard uses this table to validate traffic.
Related concept
Access ports place end devices into a single VLAN.
- ✓
It can be configured to allow traffic from specific prefixes using a static prefix list.
Why this is correct
A static prefix list can be applied to permit traffic from certain prefixes, overriding dynamic entries.
Related concept
Access ports place end devices into a single VLAN.
- ✗
It filters both incoming and outgoing IPv6 traffic on a port.
Why it's wrong here
IPv6 Source Guard filters only incoming traffic (ingress) to prevent spoofing; it does not filter outgoing traffic.
- ✗
It requires DHCPv6 snooping to be enabled on the VLAN to function.
Why it's wrong here
While DHCPv6 snooping can populate the binding table, ND Inspection can also be used; DHCPv6 snooping is not strictly required.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 300-410 questions on switching, trunking, and access-port configuration.
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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 — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: It filters IPv6 traffic based on the source IPv6 address of incoming packets. — IPv6 Source Guard filters traffic based on the source address, using the binding table. It prevents spoofing, requires DHCPv6 snooping or ND Inspection to build the table, and can be configured with a static prefix list. The incorrect options misstate the filtering direction or necessity of DHCPv6.
What should I do if I get this 300-410 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 300-410 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 18, 2026
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