The answer is that the tunnel will not come up because the IPv6IP tunnel destination must be an IPv4 address, not an IPv6 address. This is correct because the tunnel mode ipv6ip encapsulates IPv6 packets inside IPv4 packets for transport across an IPv4 network, so the tunnel destination must be a routable IPv4 address that identifies the remote endpoint. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of IPv6 transition mechanisms and the specific addressing requirements for different tunnel modes; a common trap is assuming any IP address works for the destination, but ipv6ip strictly requires an IPv4 address. To avoid this mistake, remember the mnemonic: "IPv6IP needs IPv4 to ship."
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.
Examine the following partial configuration on Router R1:
```
interface Tunnel0
ipv6 address 2001:DB8:1::1/64
tunnel source GigabitEthernet0/0
tunnel destination 2001:DB8:2::2
tunnel mode ipv6ip
```
What is the effect of this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The tunnel will not come up because the tunnel destination is an IPv6 address instead of an IPv4 address.
The tunnel mode ipv6ip requires an IPv4 address as the tunnel destination because it encapsulates IPv6 packets inside IPv4 packets for transport over an IPv4 network. In this configuration, the tunnel destination is set to an IPv6 address (2001:DB8:2::2), which is invalid for this tunnel mode, preventing the tunnel interface from coming up.
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 tunnel will successfully encapsulate IPv6 packets in IPv4 and forward them.
Why it's wrong here
The tunnel destination is an IPv6 address, but ipv6ip mode requires an IPv4 destination.
✓
The tunnel will not come up because the tunnel destination is an IPv6 address instead of an IPv4 address.
Why this is correct
In ipv6ip mode, both tunnel source and destination must be IPv4 addresses.
Related concept
Read the scenario before looking for a memorised answer.
✗
The tunnel will use IPv6 as the transport protocol, encapsulating IPv4 packets.
Why it's wrong here
ipv6ip mode encapsulates IPv6 in IPv4, not the reverse.
✗
The configuration is correct for a 6to4 tunnel.
Why it's wrong here
6to4 tunnels use a different tunnel mode and automatic destination calculation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between tunnel transport and passenger protocols, trapping candidates who confuse the tunnel destination address family with the tunnel mode requirements.
Detailed technical explanation
How to think about this question
The tunnel mode ipv6ip command implements RFC 4213 manual IPv6-over-IPv4 tunneling, where the tunnel source and destination must be IPv4 addresses. The tunnel interface creates a virtual point-to-point link that encapsulates IPv6 packets with an IPv4 header using protocol type 41. In real-world scenarios, misconfiguring the tunnel destination with an IPv6 address is a common oversight that causes the tunnel to remain in a down/down state, as the router cannot resolve an IPv6 next-hop for IPv4 encapsulation.
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: The tunnel will not come up because the tunnel destination is an IPv6 address instead of an IPv4 address. — The tunnel mode ipv6ip requires an IPv4 address as the tunnel destination because it encapsulates IPv6 packets inside IPv4 packets for transport over an IPv4 network. In this configuration, the tunnel destination is set to an IPv6 address (2001:DB8:2::2), which is invalid for this tunnel mode, preventing the tunnel interface from coming up.
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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