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 route | include Tunnel
O 2001:DB8:1::/48 [110/2]
via FE80::1, Tunnel0
O 2001:DB8:2::/48 [110/3]
via FE80::2, Tunnel1
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
OSPFv3 is running over the tunnel interfaces and these routes are reachable.
The output shows OSPF routes (indicated by 'O') learned over tunnel interfaces. Since the routes are IPv6 (2001:DB8::/48) and OSPFv3 is the IPv6-capable version of OSPF, the correct interpretation is that OSPFv3 is running over the tunnels. The 'via FE80::1, Tunnel0' confirms the next hop is a link-local address reachable through the tunnel, meaning the routes are reachable via OSPFv3 over those tunnels.
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.
The output does not indicate the transport protocol; it only shows IPv6 routing.
✓
OSPFv3 is running over the tunnel interfaces and these routes are reachable.
Why this is correct
The OSPF routes are present with next-hop addresses via tunnel interfaces.
Related concept
Read the scenario before looking for a memorised answer.
✗
Tunnel0 has a higher metric than Tunnel1.
Why it's wrong here
Tunnel0 has metric 2, Tunnel1 has metric 3; Tunnel0 has lower metric.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between OSPFv3 and OSPFv2 by using the route code 'O' in IPv6 routing tables, leading candidates to mistakenly think it could be EIGRP or that the transport must be IPv4, when in fact 'O' always means OSPF in any routing table context.
Trap categories for this question
Command / output trap
The output does not indicate the transport protocol; it only shows IPv6 routing.
Detailed technical explanation
How to think about this question
OSPFv3 (RFC 5340) runs directly over IPv6 and uses link-local addresses for neighbor adjacency, as seen in the 'via FE80::1' output. The tunnel interfaces (Tunnel0, Tunnel1) are likely IPv6-over-IPv6 or IPv6-over-IPv4 tunnels, but the key point is that OSPFv3 is the routing protocol exchanging these IPv6 routes. In real-world scenarios, engineers often use OSPFv3 over GRE tunnels to connect isolated IPv6 networks across an IPv4 backbone, but the route code 'O' always refers to OSPF, regardless of the underlying transport.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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: OSPFv3 is running over the tunnel interfaces and these routes are reachable. — The output shows OSPF routes (indicated by 'O') learned over tunnel interfaces. Since the routes are IPv6 (2001:DB8::/48) and OSPFv3 is the IPv6-capable version of OSPF, the correct interpretation is that OSPFv3 is running over the tunnels. The 'via FE80::1, Tunnel0' confirms the next hop is a link-local address reachable through the tunnel, meaning the routes are reachable via OSPFv3 over those tunnels.
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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