- A
The tunnel mode should be 'gre ipv6' because the source and destination are IPv6 addresses.
Why wrong: This is incorrect. The 'gre ipv6' mode is used when the tunnel source/destination are IPv6 addresses, not IPv4. Here the source and destination are IPv4, so 'ipv6ip' is appropriate.
- B
The tunnel interface must have an IPv4 address.
Why wrong: Incorrect. A tunnel interface does not require an IPv4 address; it can have an IPv6 address configured as shown.
- C
The tunnel source should be an interface, not an IP address.
Why wrong: Incorrect. The tunnel source can be specified as an IP address. Using an interface name is optional.
- D
The configuration is correct and will function as an IPv6 over IPv4 tunnel.
Correct. The configuration is valid for an IPv6-over-IPv4 manual tunnel.
300-410 GRE IPv6 Tunnel 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. A key principle to apply: gRE IPv6 Tunnel. 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.
Given this configuration on Router R3: ```
interface Tunnel0 no ip address
ipv6 address 2001:DB8:5::1/64 tunnel source 192.168.1.1 tunnel destination 192.168.2.2 tunnel mode ipv6ip ``` What is missing or incorrect?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The configuration is correct and will function as an IPv6 over IPv4 tunnel.
Option D is correct. The configuration uses 'tunnel mode ipv6ip', which is a valid manual IPv6-over-IPv4 tunnel. The source and destination are IPv4 addresses, as required for this tunnel mode. No changes are needed; the tunnel will function correctly for IPv6 over IPv4 transport.
Key principle: GRE IPv6 Tunnel
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 mode should be 'gre ipv6' because the source and destination are IPv6 addresses.
Why it's wrong here
This is incorrect. The 'gre ipv6' mode is used when the tunnel source/destination are IPv6 addresses, not IPv4. Here the source and destination are IPv4, so 'ipv6ip' is appropriate.
- ✗
The tunnel interface must have an IPv4 address.
Why it's wrong here
Incorrect. A tunnel interface does not require an IPv4 address; it can have an IPv6 address configured as shown.
- ✗
The tunnel source should be an interface, not an IP address.
Why it's wrong here
Incorrect. The tunnel source can be specified as an IP address. Using an interface name is optional.
- ✓
The configuration is correct and will function as an IPv6 over IPv4 tunnel.
Why this is correct
Correct. The configuration is valid for an IPv6-over-IPv4 manual tunnel.
Related concept
GRE IPv6 Tunnel
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly think that 'gre ipv6' is required for IPv6 over IPv4 tunnels, but 'ipv6ip' is a valid mode for manual tunnels. The presence of IPv4 source/destination does not necessitate GRE; it is the correct setup for 'ipv6ip'.
Trap categories for this question
Command / output trap
Incorrect. A tunnel interface does not require an IPv4 address; it can have an IPv6 address configured as shown.
Detailed technical explanation
How to think about this question
Manual IPv6-over-IPv4 tunnels (tunnel mode ipv6ip) encapsulate IPv6 packets directly in IPv4 packets with protocol type 41, without GRE overhead. The tunnel source and destination must be IPv4 addresses, and the tunnel interface itself carries an IPv6 address. In contrast, GRE IPv6 tunnels (tunnel mode gre ipv6) encapsulate any Layer 3 protocol over an IPv6 transport, using GRE headers. A common real-world mistake is confusing the transport and payload addressing, leading to incorrect mode selection.
KKey Concepts to Remember
- GRE IPv6 Tunnel
- Manual IPv6 Tunnel (ipv6ip)
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
GRE IPv6 Tunnel
Real-world example
How this comes up in practice
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. GRE IPv6 Tunnel Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review gRE IPv6 Tunnel, then practise related 300-410 questions on the same topic to reinforce the concept.
- →
IPv6 Tunneling Techniques — study guide chapter
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IPv6 Tunneling Techniques practice questions
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 Tunneling Techniques — This question tests IPv6 Tunneling Techniques — GRE IPv6 Tunnel.
What is the correct answer to this question?
The correct answer is: The configuration is correct and will function as an IPv6 over IPv4 tunnel. — Option D is correct. The configuration uses 'tunnel mode ipv6ip', which is a valid manual IPv6-over-IPv4 tunnel. The source and destination are IPv4 addresses, as required for this tunnel mode. No changes are needed; the tunnel will function correctly for IPv6 over IPv4 transport.
What should I do if I get this 300-410 question wrong?
Review gRE IPv6 Tunnel, then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
GRE IPv6 Tunnel
About these practice questions
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Last reviewed: Jun 24, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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