Quick Answer
The answer is that there are no multicast listeners on this tunnel interface. This conclusion is drawn directly from the output line showing "MLD activity: 0 joins, 0 leaves," because MLD (Multicast Listener Discovery) is the IPv6 protocol responsible for tracking group membership on a link; zero joins means no hosts have expressed interest in receiving multicast traffic, so the interface has no active listeners. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to interpret show commands for MLD verification on IPv6 tunnel interfaces, a common scenario where engineers must distinguish between the router being the querier (as indicated by "this system") and the actual presence of downstream listeners. A frequent trap is assuming that because the router is the querier, there must be listeners, but the "MLD activity" counter directly reveals membership status. Remember: querier status shows who asks, but joins and leaves show who listens—zero joins means zero listeners.
This 300-410 practice question tests your understanding of ipv6 tunneling techniques. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
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?
MLD is disabled on this interface.
Why wrong: MLD is enabled as shown.
This router is not the MLD querier.
Why wrong: The output states 'this system' is the querier.
There are no multicast listeners on this tunnel interface.
0 joins indicates no hosts have joined any multicast groups.
MLD version 1 is in use.
Why wrong: Current MLD version is 2.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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
MLD is enabled as shown.
This router is not the MLD querier.
Why it's wrong here
The output states 'this system' is the querier.
There are no multicast listeners on this tunnel interface.
Why this is correct
0 joins indicates no hosts have joined any multicast groups.
Related concept
Read the scenario before looking for a memorised answer.
MLD version 1 is in use.
Why it's wrong here
Current MLD version is 2.
Common exam traps
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.
Trap categories for this question
Command / output trap
MLD is enabled as shown.
Detailed technical explanation
MLD version 2 (defined in RFC 3810) is used by IPv6 routers to discover multicast listeners on directly attached links. The 'MLD querying router' is the elected router responsible for sending periodic general queries; the '0 joins' counter indicates no hosts have sent MLD report messages, meaning no downstream multicast group members exist on this tunnel interface.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
IPv6 Tunneling Techniques — This question tests IPv6 Tunneling Techniques — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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