hardMultiple ChoiceObjective-mapped
200-901 Practice Question: An IPv6-enabled host is trying to discover the…
An IPv6-enabled host is trying to discover the MAC address of another host on the same link. The host knows the destination IPv6 address but does not have a corresponding entry in the neighbor cache. Which protocol and message type does the host use?
⚠ Common exam trap
Cisco often tests the distinction between the solicitation (type 135) and advertisement (type 136) messages, and the trap here is that candidates may confuse Neighbor Solicitation with Router Solicitation or mistakenly think ARP is used in IPv6.
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
✓
Neighbor Solicitation (ICMPv6 type 135)
When an IPv6 host needs to resolve a known destination IPv6 address to its MAC address on the same link, it sends a Neighbor Solicitation (NS) message, which is ICMPv6 type 135. This message is multicast to the solicited-node multicast address of the target, and the host with that IPv6 address responds with a Neighbor Advertisement (ICMPv6 type 136) containing its MAC address. This process replaces ARP in IPv4 and is defined in RFC 4861.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Neighbor Advertisement (ICMPv6 type 136)
Why it's wrong here
NA is the reply, not the request.
- ✗
Router Solicitation (ICMPv6 type 133)
Why it's wrong here
RS is for router discovery.
- ✓
Neighbor Solicitation (ICMPv6 type 135)
Why this is correct
NS is used for address resolution.
- ✗
Address Resolution Protocol (ARP)
Why it's wrong here
IPv6 does not use ARP.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.