Quick Answer
The answer is that the tunnel is not carrying any IPv6 traffic. This conclusion is drawn directly from the output of the show ipv6 traffic | include tunnel command, which filters the global IPv6 traffic counters to display only tunnel-related statistics. When the counters for packets received, sent, and dropped all read zero, it confirms that no IPv6 packets have been encapsulated or decapsulated by any tunnel interface on the router, meaning the tunnel is completely idle. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret IPv6 tunnel debugging output and distinguish between a tunnel that is misconfigured versus one that simply has no traffic—a common trap is assuming zero counters indicate a configuration error when they actually show a healthy but unused tunnel. For a quick memory tip, think “Zero tunnel counters = zero tunnel traffic,” and remember that the show ipv6 traffic command aggregates all tunnel interfaces, so a single zero line means no IPv6 packets are transiting any tunnel.
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 traffic | include tunnel
0 tunnel packets received 0 tunnel packets sent 0 tunnel packets dropped
Based on this output, what can be concluded?
The tunnel is passing traffic normally.
Why wrong: Zero packets indicate no traffic.
The tunnel is not carrying any IPv6 traffic.
All counters are zero, meaning no traffic.
The tunnel is dropping all packets.
Why wrong: Dropped packets are also zero.
The tunnel is using IPsec encryption.
Why wrong: The output does not indicate encryption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The tunnel is not carrying any IPv6 traffic.
The 'show ipv6 traffic | include tunnel' command filters the output to show only lines containing 'tunnel'. The counters for packets received, sent, and dropped are all zero, which indicates that no IPv6 packets have been encapsulated or decapsulated by any tunnel interface. This means the tunnel is not carrying any IPv6 traffic, making option B 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.
The tunnel is passing traffic normally.
Why it's wrong here
Zero packets indicate no traffic.
The tunnel is not carrying any IPv6 traffic.
Why this is correct
All counters are zero, meaning no traffic.
Related concept
Read the scenario before looking for a memorised answer.
The tunnel is dropping all packets.
Why it's wrong here
Dropped packets are also zero.
The tunnel is using IPsec encryption.
Why it's wrong here
The output does not indicate encryption.
Common exam traps
Cisco often tests the misinterpretation of zero counters as 'no issues' (option A) or as 'dropping all packets' (option C), when in fact zero counters simply indicate no activity on the tunnel.
Trap categories for this question
Command / output trap
The output does not indicate encryption.
Detailed technical explanation
IPv6 tunneling techniques, such as 6to4, ISATAP, or manual GRE tunnels, rely on encapsulation of IPv6 packets inside IPv4 packets. The 'show ipv6 traffic' command displays per-protocol counters for IPv6 packets, including tunnel-related statistics that increment only when the router performs encapsulation or decapsulation. Zero counters can indicate a misconfiguration, such as an incorrect tunnel source/destination, a missing route, or a disabled tunnel interface, rather than simply no traffic.
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: The tunnel is not carrying any IPv6 traffic. — The 'show ipv6 traffic | include tunnel' command filters the output to show only lines containing 'tunnel'. The counters for packets received, sent, and dropped are all zero, which indicates that no IPv6 packets have been encapsulated or decapsulated by any tunnel interface. This means the tunnel is not carrying any IPv6 traffic, making option B 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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