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300-410 Practice Question: The maximum number of IPv6 over IPv4 tunnels that…
What is the maximum number of IPv6 over IPv4 tunnels that can be configured on a Cisco IOS router?
⚠ Common exam trap
Cisco often tests the misconception that there is a fixed numerical limit (like 256, 1024, or 64) for IPv6 over IPv4 tunnels, when in fact the correct answer is that the limit is platform-dependent and resource-driven.
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
✓
Platform-dependent, no fixed maximum.
C is correct because the maximum number of IPv6 over IPv4 tunnels on a Cisco IOS router is platform-dependent and limited by available system resources such as CPU and memory, not by a fixed software limit. Cisco IOS does not impose a hard-coded maximum; the actual number depends on the router model, the type of tunnel (e.g., manual, 6to4, ISATAP, GRE), and the configuration complexity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
256
Why it's wrong here
No such fixed limit.
- ✗
1024
Why it's wrong here
No such fixed limit.
- ✓
Platform-dependent, no fixed maximum.
Why this is correct
The number is limited by memory and CPU.
- ✗
64
Why it's wrong here
No such fixed limit.
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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.