- A
Configure tunnel mode gre ip on the tunnel interface.
Correct. GRE is the default tunnel mode for IPv6 transport; explicit configuration ensures correct operation.
- B
Assign an IPv6 address to the tunnel interface.
Correct. The tunnel interface must have an IPv6 address to enable IPv6 routing over the tunnel.
- C
Configure tunnel mode ipv6ip on the tunnel interface.
Why wrong: Incorrect. tunnel mode ipv6ip is used for IPv6-in-IPv4 manual tunnels, not GRE. GRE uses tunnel mode gre ip.
- D
Set the tunnel destination to the remote IPv6 address.
Why wrong: Incorrect. The tunnel destination must be the remote IPv4 address, not IPv6, because the tunnel transports IPv6 over IPv4.
- E
Place the tunnel interface in a VRF to separate IPv6 traffic.
Why wrong: Incorrect. VRF is not required for basic GRE IPv6 transport; it is an optional feature for traffic isolation.
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.
An engineer must configure a GRE tunnel to transport IPv6 traffic over an IPv4-only network. Which TWO configuration steps are required? (Choose TWO.)
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
Configure tunnel mode gre ip on the tunnel interface.
Option A is correct because 'tunnel mode gre ip' configures the tunnel interface to use Generic Routing Encapsulation (GRE) over IPv4, which is the standard method for encapsulating any Layer 3 protocol (including IPv6) inside IPv4 packets. This mode sets the tunnel to use IP protocol 47 (GRE) and allows the transport of IPv6 traffic across an IPv4-only network.
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.
- ✓
Configure tunnel mode gre ip on the tunnel interface.
Why this is correct
Correct. GRE is the default tunnel mode for IPv6 transport; explicit configuration ensures correct operation.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Assign an IPv6 address to the tunnel interface.
Why this is correct
Correct. The tunnel interface must have an IPv6 address to enable IPv6 routing over the tunnel.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure tunnel mode ipv6ip on the tunnel interface.
Why it's wrong here
Incorrect. tunnel mode ipv6ip is used for IPv6-in-IPv4 manual tunnels, not GRE. GRE uses tunnel mode gre ip.
- ✗
Set the tunnel destination to the remote IPv6 address.
Why it's wrong here
Incorrect. The tunnel destination must be the remote IPv4 address, not IPv6, because the tunnel transports IPv6 over IPv4.
- ✗
Place the tunnel interface in a VRF to separate IPv6 traffic.
Why it's wrong here
Incorrect. VRF is not required for basic GRE IPv6 transport; it is an optional feature for traffic isolation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between GRE (tunnel mode gre ip) and IPv6-in-IPv4 manual tunneling (tunnel mode ipv6ip), where candidates mistakenly choose ipv6ip for IPv6 transport, forgetting that GRE is the standard for multiprotocol encapsulation and is required when the question explicitly mentions 'GRE tunnel'.
Detailed technical explanation
How to think about this question
GRE tunneling (RFC 2784) encapsulates IPv6 packets with a GRE header and an outer IPv4 header, allowing IPv6 traffic to traverse IPv4-only infrastructure. The tunnel interface must have an IPv6 address assigned (Option B) to act as the source/destination for IPv6 routing, while the tunnel source and destination are IPv4 addresses. In real-world scenarios, GRE tunnels are often used to connect remote IPv6 islands over an IPv4 backbone, and they can also carry routing protocols like OSPFv3 or EIGRP for IPv6.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure tunnel mode gre ip on the tunnel interface. — Option A is correct because 'tunnel mode gre ip' configures the tunnel interface to use Generic Routing Encapsulation (GRE) over IPv4, which is the standard method for encapsulating any Layer 3 protocol (including IPv6) inside IPv4 packets. This mode sets the tunnel to use IP protocol 47 (GRE) and allows the transport of IPv6 traffic across an IPv4-only network.
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.
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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