- A
Set 'Forged transmits' to 'Reject'.
When forged transmits is rejected, the vSwitch drops frames that do not originate from the VM's actual MAC address, thus preventing MAC spoofing.
- B
Set 'MAC address changes' to 'Reject'.
Why wrong: This policy controls whether the VM guest OS can change the MAC address (e.g., via software), but it does not prevent the VM from sending frames with a forged source MAC.
- C
Set 'Promiscuous mode' to 'Reject'.
Why wrong: Promiscuous mode rejection prevents the VM from receiving frames not destined for it, but does not prevent MAC impersonation.
- D
Enable traffic shaping and set a low average bandwidth.
Why wrong: Traffic shaping controls bandwidth usage, not security or MAC behavior.
Question 455 of 521
VCP-DCV Configure and Manage vSphere Networking Practice Question
This VCP-DCV practice question tests your understanding of configure and manage vsphere networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization has deployed a vSphere Distributed Switch (vDS) across multiple ESXi hosts. The security team requires that no virtual machine can change its MAC address to impersonate another device. Which security policy setting on the distributed port group should be configured to fulfill this requirement?
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
✓
Set 'Forged transmits' to 'Reject'.
Option A is correct because the 'Forged transmits' policy, when set to 'Reject', drops any outbound frames with a source MAC address different from the one assigned to the virtual NIC. This prevents a VM from impersonating another device by spoofing its MAC address. Option B is incorrect because 'MAC address changes' controls whether the VM can change its effective MAC address, but this does not prevent the VM from sending frames with a forged source MAC. Option C is incorrect because 'Promiscuous mode' allows the VM to see all traffic on the port, which is a security risk but unrelated to MAC impersonation. Option D is incorrect because traffic shaping limits bandwidth, not MAC security.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set 'Forged transmits' to 'Reject'.
Why this is correct
When forged transmits is rejected, the vSwitch drops frames that do not originate from the VM's actual MAC address, thus preventing MAC spoofing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set 'MAC address changes' to 'Reject'.
Why it's wrong here
This policy controls whether the VM guest OS can change the MAC address (e.g., via software), but it does not prevent the VM from sending frames with a forged source MAC.
- ✗
Set 'Promiscuous mode' to 'Reject'.
Why it's wrong here
Promiscuous mode rejection prevents the VM from receiving frames not destined for it, but does not prevent MAC impersonation.
- ✗
Enable traffic shaping and set a low average bandwidth.
Why it's wrong here
Traffic shaping controls bandwidth usage, not security or MAC behavior.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the VCP-DCV exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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 |
What to study next
Got this wrong? Here's your next step.
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Configure and Manage vSphere Networking — study guide chapter
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Configure and Manage vSphere Networking practice questions
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FAQ
Questions learners often ask
What does this VCP-DCV question test?
Configure and Manage vSphere Networking — This question tests Configure and Manage vSphere Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set 'Forged transmits' to 'Reject'. — Option A is correct because the 'Forged transmits' policy, when set to 'Reject', drops any outbound frames with a source MAC address different from the one assigned to the virtual NIC. This prevents a VM from impersonating another device by spoofing its MAC address. Option B is incorrect because 'MAC address changes' controls whether the VM can change its effective MAC address, but this does not prevent the VM from sending frames with a forged source MAC. Option C is incorrect because 'Promiscuous mode' allows the VM to see all traffic on the port, which is a security risk but unrelated to MAC impersonation. Option D is incorrect because traffic shaping limits bandwidth, not MAC security.
What should I do if I get this VCP-DCV question wrong?
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 24, 2026
This VCP-DCV practice question is part of Courseiva's free VMware 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 VCP-DCV exam.
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