Question 221 of 521

vSphere Security →hardMultiple ChoiceObjective-mapped

VCP-DCV vSphere Security Practice Question

This VCP-DCV practice question tests your understanding of vsphere security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

A company runs a critical e-commerce platform on a vSphere 7 cluster with ESXi hosts connected to a vSAN datastore. The environment uses vSphere Trust Authority (vTA) and VM encryption with an external KMS. Recently, after a successful vTA attestation, one of the VMs (WebServer-01) failed to power on with the error: 'Unable to decrypt the encrypted virtual machine upon re-registration. Reason: The KMS server is unreachable.' The administrator verifies that other encrypted VMs on the same host power on successfully. The KMS cluster consists of two servers: KMS-01 and KMS-02, both accessible from the management network. The administrator checks the VM's configuration and finds that it uses a custom storage policy with encryption. What is the most likely cause of this specific VM's failure?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The vCenter Server's KMS cluster configuration has been deleted, affecting all VMs but not this one.
Why wrong: If the vCenter Server's KMS cluster configuration were deleted, all VMs would be affected, not just this one. Additionally, the error would likely occur for all encrypted VMs, but other VMs power on successfully.
B
The storage policy used by the VM has been modified and no longer includes encryption.
Why wrong: Modifying the storage policy to no longer include encryption would not affect the existing encryption of the VM. The VM remains encrypted with its original key, and the storage policy change only applies to new disks or VMs. The error is about key retrieval, not policy.
C
The vTA attestation process failed for the VM's host, but the error message is misleading.
Why wrong: vTA attestation is used to establish trust for encryption operations, but a failed attestation would cause a different error (e.g., 'Host not trusted'). The error message specifically states the KMS server is unreachable, indicating a different issue.
D
The VM's encryption key was retrieved from a different KMS server that is now unavailable, and the key ID in the VM's metadata points to that KMS server.
Correct. The VM's encryption key may have been issued by a specific KMS server (e.g., KMS-01) that is now unreachable, while the KMS cluster overall is accessible. Other VMs may have keys from a different, reachable server (e.g., KMS-02), explaining why they power on successfully.

Full breakdown with real-world context →

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 VM's encryption key was retrieved from a different KMS server that is now unavailable, and the key ID in the VM's metadata points to that KMS server.

The error 'Unable to decrypt the encrypted virtual machine upon re-registration. Reason: The KMS server is unreachable' indicates that the ESXi host cannot contact the KMS server to retrieve the VM's encryption key. Since other encrypted VMs on the same host power on successfully, the host can reach the KMS cluster, but this specific VM's encryption key may have been issued by a different KMS server (e.g., an older or alternative KMS) that is now unavailable. The key ID stored in the VM's metadata points to that unreachable server, causing the failure. Option A is incorrect because if the vCenter KMS cluster configuration were deleted, all VMs would be affected. Option B is incorrect because modifying the storage policy does not change the existing encryption key; the VM remains encrypted with its original key. Option C is incorrect because vTA attestation is separate from KMS key retrieval; the error message is specific to KMS unavailability.

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.

✗
The vCenter Server's KMS cluster configuration has been deleted, affecting all VMs but not this one.
Why it's wrong here
If the vCenter Server's KMS cluster configuration were deleted, all VMs would be affected, not just this one. Additionally, the error would likely occur for all encrypted VMs, but other VMs power on successfully.
✗
The storage policy used by the VM has been modified and no longer includes encryption.
Why it's wrong here
Modifying the storage policy to no longer include encryption would not affect the existing encryption of the VM. The VM remains encrypted with its original key, and the storage policy change only applies to new disks or VMs. The error is about key retrieval, not policy.
✗
The vTA attestation process failed for the VM's host, but the error message is misleading.
Why it's wrong here
vTA attestation is used to establish trust for encryption operations, but a failed attestation would cause a different error (e.g., 'Host not trusted'). The error message specifically states the KMS server is unreachable, indicating a different issue.
✓
The VM's encryption key was retrieved from a different KMS server that is now unavailable, and the key ID in the VM's metadata points to that KMS server.
Why this is correct
Correct. The VM's encryption key may have been issued by a specific KMS server (e.g., KMS-01) that is now unreachable, while the KMS cluster overall is accessible. Other VMs may have keys from a different, reachable server (e.g., KMS-02), explaining why they power on successfully.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

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.

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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FAQ

Questions learners often ask

What does this VCP-DCV question test?

vSphere Security — This question tests vSphere Security — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The VM's encryption key was retrieved from a different KMS server that is now unavailable, and the key ID in the VM's metadata points to that KMS server. — The error 'Unable to decrypt the encrypted virtual machine upon re-registration. Reason: The KMS server is unreachable' indicates that the ESXi host cannot contact the KMS server to retrieve the VM's encryption key. Since other encrypted VMs on the same host power on successfully, the host can reach the KMS cluster, but this specific VM's encryption key may have been issued by a different KMS server (e.g., an older or alternative KMS) that is now unavailable. The key ID stored in the VM's metadata points to that unreachable server, causing the failure. Option A is incorrect because if the vCenter KMS cluster configuration were deleted, all VMs would be affected. Option B is incorrect because modifying the storage policy does not change the existing encryption key; the VM remains encrypted with its original key. Option C is incorrect because vTA attestation is separate from KMS key retrieval; the error message is specific to KMS unavailability.

What should I do if I get this VCP-DCV question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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