mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Configures IPv6 Source Guard on an interface:…
A network engineer configures IPv6 Source Guard on an interface:
interface GigabitEthernet0/3
ipv6 verify source
What is the immediate effect of this command?
⚠ Common exam trap
Cisco often tests the misconception that 'ipv6 verify source' requires a preconfigured static binding, but the command works dynamically with DHCPv6 snooping, and the trap is that candidates overlook the DHCP snooping dependency.
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
✓
The interface filters all incoming IPv6 traffic unless the source address is in the DHCP snooping binding table.
The 'ipv6 verify source' command enables IPv6 Source Guard, which filters incoming IPv6 traffic on the interface. It permits only packets whose source IPv6 address matches a binding in the DHCPv6 snooping binding table (or static IPv6 source guard entries). Traffic from unknown or mismatched sources is dropped, preventing spoofing attacks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The interface filters all incoming IPv6 traffic unless the source address is in the DHCP snooping binding table.
Why this is correct
IPv6 Source Guard checks source IPv6 and MAC against the binding table; unmatched traffic is dropped.
- ✗
The interface allows all IPv6 traffic but logs violations.
Why it's wrong here
IPv6 Source Guard drops traffic, not just logs.
- ✗
The interface only filters Neighbor Discovery messages.
Why it's wrong here
It filters all IPv6 traffic, not just ND.
- ✗
The interface requires a static binding to be configured first.
Why it's wrong here
It uses dynamic DHCP snooping bindings; static bindings are optional.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.