Question 391 of 1,420
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350-401 Practice Question: An engineer is configuring a virtual machine on a…
An engineer is configuring a virtual machine on a Microsoft Hyper-V host. The VM runs a legacy application that requires a static MAC address. The engineer sets the MAC address in the VM settings. After the VM starts, the application cannot communicate on the network. The engineer verifies that the MAC address is not duplicated on the network. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the misconception that any static MAC address can be assigned to a Hyper-V VM, when in reality the address must fall within the Microsoft OUI range (00-15-5D-XX-XX-XX) to be accepted by the hypervisor.
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 static MAC address is not within the allowed range for Hyper-V virtual machines.
Hyper-V enforces a specific range for static MAC addresses assigned to virtual machines. The default allowed range is 00-15-5D-XX-XX-XX, derived from the Microsoft Organizationally Unique Identifier (OUI). If the engineer configured a MAC address outside this range (e.g., starting with a different OUI), Hyper-V will not allow the VM to use it, effectively breaking network communication even though the address is not duplicated on the network.
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 static MAC address is not within the allowed range for Hyper-V virtual machines.
Why this is correct
Correct because Hyper-V enforces a specific MAC address range for static assignments to avoid conflicts.
- ✗
The VM is configured to use a dynamic MAC address, overriding the static setting.
Why it's wrong here
Incorrect because Hyper-V allows static MAC addresses when configured.
- ✗
The VM's network adapter is set to use the legacy network adapter type.
Why it's wrong here
Incorrect because legacy adapters also support static MAC addresses.
- ✗
The VM is a generation 2 VM, which does not support static MAC addresses.
Why it's wrong here
Incorrect because generation 2 VMs support static MAC addresses.
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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Last reviewed: Jun 24, 2026
This 350-401 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 350-401 exam.
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