The correct answer is that this is a manually configured IPv6/IP tunnel, not a 6to4 tunnel, because the output shows a statically defined destination IPv4 address of 192.168.2.1. In a true 6to4 tunnel, the destination is automatically derived from the 6to4 prefix 2002::/16 and the embedded IPv4 address, so a fixed destination in the tunnel brief indicates manual configuration. On the Cisco CCNP ENARSI 300-410 exam, this distinction tests your understanding of tunnel types and their configuration outputs, often appearing as a trap where the “6to4” label in the output misleads candidates into ignoring the static destination. Remember that 6to4 tunnels never have a manually set destination; the keyword “6to4” in the interface description is just a default label, not proof of the tunnel type. A quick memory tip: if you see a destination address in the tunnel brief, it’s manual—6to4 derives its destination automatically.
300-410 IPv6 Tunneling Techniques Practice Question
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 tunnel brief
Tunnel2: IPv6/IP, intf id 0/0/2, 6to4, mtu 1280
Source: 192.168.1.1 (GigabitEthernet0/0)
Destination: 192.168.2.1
Tunnel transport: IPv4
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
This tunnel is actually a manually configured IPv6/IP tunnel, not a 6to4 tunnel.
The output shows a manually configured IPv6/IP tunnel because it specifies both a source and destination IPv4 address. In a true 6to4 tunnel, the destination is automatically derived from the 6to4 prefix (2002::/16) and the destination IPv4 address, not statically configured. The presence of a static destination address indicates this is a manually configured tunnel, not a 6to4 tunnel.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
This is a correctly configured 6to4 tunnel.
Why it's wrong here
6to4 tunnels do not have a configured destination; the destination is derived from the 6to4 prefix.
✓
This tunnel is actually a manually configured IPv6/IP tunnel, not a 6to4 tunnel.
Why this is correct
The presence of a specific destination address indicates a manual tunnel; 6to4 tunnels have no configured destination.
Related concept
Read the scenario before looking for a memorised answer.
✗
The tunnel is an ISATAP tunnel.
Why it's wrong here
ISATAP tunnels use a different interface type and addressing.
✗
The tunnel is in an up/up state and passing traffic.
Why it's wrong here
The output does not show interface status; only configuration parameters.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between automatic 6to4 tunnels (where the destination is derived from the IPv6 address) and manually configured tunnels (where both source and destination are explicitly set), leading candidates to assume any tunnel with '6to4' in the output is correctly configured.
Trap categories for this question
Command / output trap
The output does not show interface status; only configuration parameters.
Detailed technical explanation
How to think about this question
6to4 tunnels (RFC 3056) use the 2002::/16 prefix where the next 32 bits are the IPv4 address of the tunnel source, and the destination is automatically determined by the destination IPv6 address. In contrast, manually configured tunnels (RFC 2893) require explicit source and destination IPv4 addresses. The 'show ipv6 tunnel brief' command reveals the configured parameters; a 6to4 tunnel would show '6to4' as the tunnel mode but would not have a static destination address.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
IPv6 Tunneling Techniques — This question tests IPv6 Tunneling Techniques — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: This tunnel is actually a manually configured IPv6/IP tunnel, not a 6to4 tunnel. — The output shows a manually configured IPv6/IP tunnel because it specifies both a source and destination IPv4 address. In a true 6to4 tunnel, the destination is automatically derived from the 6to4 prefix (2002::/16) and the destination IPv4 address, not statically configured. The presence of a static destination address indicates this is a manually configured tunnel, not a 6to4 tunnel.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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