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.
In a 6to4 tunnel, how is the tunnel destination address determined?
It is manually configured.
Why wrong: 6to4 is automatic; no manual destination.
It is derived from the IPv6 destination address using the 2002::/16 prefix.
The IPv4 address is extracted from the 6to4 prefix.
It is obtained via DNS.
Why wrong: DNS is not used for 6to4 destination.
It is the same as the tunnel source.
Why wrong: The destination is different from the source.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It is derived from the IPv6 destination address using the 2002::/16 prefix.
In a 6to4 tunnel, the tunnel destination address is automatically derived from the IPv6 destination address by extracting the IPv4 address embedded in the 2002::/16 prefix. Specifically, the first 16 bits of the IPv6 destination are 2002, and the next 32 bits represent the IPv4 address of the remote 6to4 router. This allows the tunnel to be dynamically established without manual configuration of each destination.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
It is manually configured.
Why it's wrong here
6to4 is automatic; no manual destination.
It is derived from the IPv6 destination address using the 2002::/16 prefix.
Why this is correct
The IPv4 address is extracted from the 6to4 prefix.
Related concept
Read the scenario before looking for a memorised answer.
It is obtained via DNS.
Why it's wrong here
DNS is not used for 6to4 destination.
It is the same as the tunnel source.
Why it's wrong here
The destination is different from the source.
Common exam traps
Cisco often tests the distinction between automatic 6to4 tunnels and manually configured tunnels, where candidates mistakenly think all tunnels require manual destination configuration, but 6to4 uniquely derives it from the IPv6 address.
Detailed technical explanation
6to4 is defined in RFC 3056 and uses the 2002::/16 prefix, where the next 32 bits are the IPv4 address of the remote 6to4 router written in hexadecimal. For example, an IPv6 destination of 2002:ac10:0a01::1 embeds the IPv4 address 172.16.10.1. The tunnel interface automatically encapsulates IPv6 packets with an IPv4 header using this extracted destination, enabling connectivity between isolated IPv6 islands over an IPv4 network without explicit tunnel configuration.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
IPv6 Tunneling Techniques — This question tests IPv6 Tunneling Techniques — Read the scenario before looking for a memorised answer..
The correct answer is: It is derived from the IPv6 destination address using the 2002::/16 prefix. — In a 6to4 tunnel, the tunnel destination address is automatically derived from the IPv6 destination address by extracting the IPv4 address embedded in the 2002::/16 prefix. Specifically, the first 16 bits of the IPv6 destination are 2002, and the next 32 bits represent the IPv4 address of the remote 6to4 router. This allows the tunnel to be dynamically established without manual configuration of each destination.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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