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 R5:
```
interface Tunnel0
ipv6 address 2001:DB8:7::1/64
tunnel source 192.168.10.1
tunnel destination 192.168.20.2
tunnel mode ipv6ip
tunnel ttl 64
```
What is the effect?
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 work, and the TTL field in the outer IPv4 header will be set to 64.
Option B is correct because the configuration creates an IPv6-over-IPv4 manual tunnel (tunnel mode ipv6ip). The tunnel source is specified as an IP address, which is valid; the router uses that address as the source of the outer IPv4 header. The 'tunnel ttl 64' command explicitly sets the Time-to-Live field in the outer IPv4 header to 64, overriding the default value.
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 not work because the tunnel source is an IP address, not an interface.
Why it's wrong here
Using an IP address as tunnel source is allowed.
✓
The tunnel will work, and the TTL field in the outer IPv4 header will be set to 64.
Why this is correct
The 'tunnel ttl' command sets the TTL in the outer IPv4 header.
Related concept
Read the scenario before looking for a memorised answer.
✗
The tunnel mode should be 'gre ip' for IPv6 over IPv4.
Why it's wrong here
ipv6ip is correct for IPv6 over IPv4 without GRE.
✗
The tunnel will use the IPv6 TTL for the outer header.
Why it's wrong here
The outer header uses IPv4 TTL, set by 'tunnel ttl'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that the tunnel source must be an interface name, or that the outer header's TTL is inherited from the inner packet, leading candidates to incorrectly eliminate the correct answer.
Detailed technical explanation
How to think about this question
In a manual IPv6-over-IPv4 tunnel (tunnel mode ipv6ip), the router encapsulates the entire IPv6 packet inside an IPv4 packet with protocol type 41. The 'tunnel ttl' command controls the outer IPv4 TTL, which is decremented by each intermediate IPv4 router; this is independent of the inner IPv6 Hop Limit. A real-world scenario where this matters is when the tunnel traverses multiple IPv4 hops and you need to ensure the outer packet does not expire before reaching the tunnel destination.
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 work, and the TTL field in the outer IPv4 header will be set to 64. — Option B is correct because the configuration creates an IPv6-over-IPv4 manual tunnel (tunnel mode ipv6ip). The tunnel source is specified as an IP address, which is valid; the router uses that address as the source of the outer IPv4 header. The 'tunnel ttl 64' command explicitly sets the Time-to-Live field in the outer IPv4 header to 64, overriding the default value.
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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