mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 neighbors
IPv6 Address Age Link-layer Addr State Interface 2001:DB8:1::1 0 aaaa.bbbb.cccc REACH Gi0/0/0 2001:DB8:1::2 10 aaaa.bbbb.cccd STALE Gi0/0/0 2001:DB8:1::3 - aaaa.bbbb.ccce DELAY Gi0/0/1 FE80::1 0 aaaa.bbbb.cccf REACH Gi0/0/0
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the misconception that STALE means unreachable or that DELAY is a failure state, when in fact STALE is a normal aging state and DELAY is a brief waiting period before probing.
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 neighbor 2001:DB8:1::3 is in DELAY state, meaning a Neighbor Solicitation will be sent soon.
The DELAY state in IPv6 Neighbor Discovery (ND) indicates that a neighbor has not been confirmed reachable within the last 5 seconds, and the router will send a Neighbor Solicitation (NS) message after the DELAY timer expires (default 5 seconds) to verify reachability. The entry for 2001:DB8:1::3 shows a hyphen in the Age column, meaning it was just created or refreshed, and it is in DELAY, so an NS will be sent soon.
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 neighbors are in a stable state.
Why it's wrong here
The DELAY state indicates a transition; not all are stable.
- ✓
The neighbor 2001:DB8:1::3 is in DELAY state, meaning a Neighbor Solicitation will be sent soon.
Why this is correct
DELAY state means a NS is pending after a delay timer.
- ✗
The neighbor 2001:DB8:1::2 is unreachable.
Why it's wrong here
STALE state means the entry is valid but not recently verified.
- ✗
The link-local address FE80::1 is not valid.
Why it's wrong here
It is REACH, so it is valid.
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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.