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300-410 Practice Question: The default value of the 'limit' parameter in the…
What is the default value of the 'limit' parameter in the 'ipv6 nd prefix' command for the number of prefixes advertised in RA messages?
⚠ Common exam trap
Cisco often tests the default value of the 'limit' parameter to catch candidates who confuse it with other common IPv6 defaults, such as the 64-bit prefix length or the 32-byte option size, leading them to pick 8, 32, or 64 instead of the correct 16.
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
✓
16
The default value of the 'limit' parameter in the 'ipv6 nd prefix' command is 16, as defined by Cisco IOS. This parameter controls the maximum number of IPv6 prefixes that can be advertised in Router Advertisement (RA) messages. When the number of prefixes exceeds this limit, the router will not include additional prefixes in the RA, ensuring the message stays within reasonable size constraints.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
8
Why it's wrong here
8 is not the default; it is a common manual setting.
- ✓
16
Why this is correct
Correct. The default limit is 16 prefixes.
- ✗
32
Why it's wrong here
32 is not the default; it is a possible manual setting.
- ✗
64
Why it's wrong here
64 is not the default; it is too high for typical configurations.
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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.