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300-410 Practice Question: In a 6to4 tunnel, how is the tunnel destination…
In a 6to4 tunnel, how is the tunnel destination address determined?
⚠ Common exam trap
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.
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
✓
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.
Answer analysis
Option-by-option breakdown
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.