mediumMultiple Choice
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 mld interface tunnel 0
Tunnel0 is up, line protocol is up Internet address is FE80::1 MLD is enabled on interface Current MLD version is 2 MLD query interval is 125 seconds MLD querier timeout is 255 seconds MLD max query response time is 10 seconds Last member query response interval is 1 second MLD activity: 0 joins, 0 leaves MLD querying router is FE80::1 (this system)
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between 'MLD enabled' and 'active listeners' — candidates may mistakenly think that MLD being enabled implies there are active group members, but the 'joins' counter directly reveals listener activity.
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
✓
There are no multicast listeners on this tunnel interface.
The output shows 'MLD activity: 0 joins, 0 leaves', indicating that no multicast listeners have joined any multicast group on this tunnel interface. Since MLD (Multicast Listener Discovery) is used to track group membership, zero joins means there are no active listeners. Therefore, option C is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MLD is disabled on this interface.
Why it's wrong here
The output states "MLD is enabled on interface", directly contradicting this option. It is tempting because zero joins and zero leaves can look like inactivity, but those counters track group membership events only; MLD itself is running and R1 is acting as querier on Tunnel0.
- ✗
This router is not the MLD querier.
Why it's wrong here
The line "MLD querying router is FE80::1 (this system)" states that R1 itself is the querier, contradicting this option. It is tempting because zero joins and leaves could suggest no querier activity, but that counter reflects group membership events, not querier election status on the interface.
- ✓
There are no multicast listeners on this tunnel interface.
Why this is correct
The MLD activity counters show zero joins and zero leaves, meaning no hosts have sent membership reports on Tunnel0. The router itself is the querier, so no downstream listeners exist; multicast traffic forwarded here would have no receivers.
- ✗
MLD version 1 is in use.
Why it's wrong here
The output explicitly states "Current MLD version is 2", so version 1 is not in use. It is tempting because MLDv1 remains common on older IPv6 deployments, but the interface has negotiated version 2, which adds source-specific multicast support and is required when hosts need SSM group joins.
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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.