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300-410 Practice Question: An engineer configures 'ipv6 nd suppress' on a…
An engineer configures 'ipv6 nd suppress' on a switch port to prevent the switch from sending Router Advertisements. However, after this configuration, hosts on that port cannot obtain IPv6 addresses via SLAAC, even though a router on another port is sending RAs. What is the most likely explanation?
⚠ Common exam trap
Cisco often tests the misconception that 'ipv6 nd suppress' only stops the switch from sending RAs, when in fact it also blocks forwarding of RAs received from other ports, which is the key trap here.
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
✓
The 'ipv6 nd suppress' command blocks all RA traffic on the port, including RAs forwarded from other ports.
The 'ipv6 nd suppress' command on a switch port prevents the switch from sending its own Router Advertisements (RAs) and also blocks all incoming RAs from being forwarded out that port. Since SLAAC relies on hosts receiving RAs to learn the prefix and other parameters, blocking the RAs from the router on another port prevents the hosts from obtaining IPv6 addresses via SLAAC.
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 'ipv6 nd suppress' command blocks all RA traffic on the port, including RAs forwarded from other ports.
Why this is correct
Suppress prevents any RA from being sent or forwarded on that port.
- ✗
The router's RAs are being filtered by an ACL on the switch.
Why it's wrong here
No ACL is mentioned.
- ✗
The hosts must be configured to use DHCPv6 instead of SLAAC.
Why it's wrong here
SLAAC should work if RAs are received.
- ✗
The switch port is in a different VLAN than the router.
Why it's wrong here
VLAN mismatch would be a different issue.
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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.