300-410 IPv6 Tunneling Techniques Practice Question
This 300-410 practice question tests your understanding of ipv6 tunneling techniques. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Consider this configuration on Router R2:
```
interface Tunnel0
ipv6 address 2001:DB8:3::1/64
tunnel source GigabitEthernet0/0
tunnel mode gre ipv6
tunnel destination 2001:DB8:4::2
```
Which statement is true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
This tunnel will encapsulate packets using GRE over an IPv6 transport.
The configuration shows a tunnel with `tunnel mode gre ipv6`, which explicitly sets the tunnel to use GRE encapsulation over an IPv6 transport. The tunnel source and destination are IPv6 addresses, and GRE can carry multiple protocols (including IPv4, IPv6, and others) over the IPv6 transport. Therefore, option C is correct because the tunnel encapsulates packets using GRE over an IPv6 transport.
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 tunnel can only carry IPv6 traffic.
Why it's wrong here
GRE can carry multiple protocols; the transport is IPv6, but payload can be IPv4, IPv6, etc.
✗
The tunnel source and destination must be IPv4 addresses.
Why it's wrong here
With 'gre ipv6', the transport is IPv6, so source and destination are IPv6.
✓
This tunnel will encapsulate packets using GRE over an IPv6 transport.
Why this is correct
GRE over IPv6 is correctly configured, allowing multiprotocol payload.
Related concept
Read the scenario before looking for a memorised answer.
✗
The tunnel mode should be 'ipv6ip' for IPv6 transport.
Why it's wrong here
ipv6ip is for IPv6 over IPv4, not GRE over IPv6.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'tunnel mode gre ipv6' (GRE over IPv6 transport) and 'tunnel mode ipv6ip' (IPv6 over IPv4 transport), and candidates mistakenly assume that any tunnel with IPv6 addresses must use ipv6ip mode.
Detailed technical explanation
How to think about this question
GRE over IPv6 (RFC 2473) uses a GRE header between the inner packet and the outer IPv6 header, allowing flexible encapsulation of various protocols. In this configuration, the tunnel interface has an IPv6 address in the 2001:DB8:3::/64 subnet, and the outer transport uses IPv6 addresses, so the entire encapsulated packet (including the GRE header) is carried inside an IPv6 packet. A real-world scenario is connecting two IPv6 sites over an IPv6-only core while needing to transport legacy IPv4 traffic or multicast.
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 will encapsulate packets using GRE over an IPv6 transport. — The configuration shows a tunnel with `tunnel mode gre ipv6`, which explicitly sets the tunnel to use GRE encapsulation over an IPv6 transport. The tunnel source and destination are IPv6 addresses, and GRE can carry multiple protocols (including IPv4, IPv6, and others) over the IPv6 transport. Therefore, option C is correct because the tunnel encapsulates packets using GRE over an IPv6 transport.
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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