mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify IPv6 binding…
A network engineer runs the following command to verify IPv6 binding table:
R1# show ipv6 neighbors binding
IPv6 Address Age Link-layer Addr State Interface VLAN Policy 2001:db8::1 10 0011.2233.4455 REACH Fa0/1 10 TRUSTED 2001:db8::2 5 00aa.bbcc.ddee STALE Fa0/0 10 INSPECT 2001:db8::3 0 1111.2222.3333 INCOMP Fa0/0 10 -
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misinterpretation of the 'show ipv6 neighbors binding' output by confusing it with 'show ipv6 neighbors' (which shows the ND cache), leading candidates to overlook the FHS-specific policy column and state meanings, especially the significance of INCOMP and STALE states in security contexts.
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 binding table shows three entries: one reachable on trusted port, one stale on untrusted port, and one incomplete, indicating active ND learning.
The output of 'show ipv6 neighbors binding' displays the IPv6 binding table used in First Hop Security (FHS) features like IPv6 Snooping. The entry for 2001:db8::1 has a REACH state on interface Fa0/1 with a TRUSTED policy, indicating it is reachable on a trusted port. The entry for 2001:db8::2 is STALE on Fa0/0 with an INSPECT policy, meaning it is on an untrusted port and requires verification. The entry for 2001:db8::3 is INCOMP (incomplete) on Fa0/0, showing an ongoing Neighbor Discovery (ND) process where the link-layer address has not yet been resolved.
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 binding table shows three entries: one reachable on trusted port, one stale on untrusted port, and one incomplete, indicating active ND learning.
Why this is correct
The output correctly shows the state and policy for each entry.
- ✗
The binding table is empty, indicating no ND activity.
Why it's wrong here
There are three entries, so it is not empty.
- ✗
The binding table shows all entries as reachable, indicating stable neighbor relationships.
Why it's wrong here
One entry is STALE and one is INCOMP, not all reachable.
- ✗
The binding table is only for DHCPv6-learned addresses.
Why it's wrong here
The table includes ND-learned addresses, not just DHCPv6.
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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.