The answer is that the IAM user lacks permission to use the specified customer-managed KMS key. When creating an Aurora MySQL cluster with the AWS CLI, the --kms-key-id parameter points to a specific KMS key, but the IAM role or user executing the command must have the kms:Encrypt, kms:Decrypt, and kms:CreateGrant permissions on that key; without these, the cluster creation fails even if the key exists and is valid. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of how KMS key policies interact with IAM policies during Aurora provisioning—a common trap is assuming the default KMS key is always used or that any key works automatically. Remember that specifying a customer-managed key shifts permission responsibility from AWS to your account, so always verify the IAM principal has explicit KMS actions allowed. Memory tip: “Key plus IAM equals access granted—forget either, and creation is slanted.”
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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.
Network Topology
Refer to the exhibit. A company is creating an Aurora MySQL cluster using the AWS CLI. The command fails with an error. The company has a default KMS key but the command specifies a customer-managed KMS key. What is the most likely cause of the 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IAM user does not have permission to use the specified KMS key
Option B is correct because the IAM role used to run the CLI command must have permission to use the specified KMS key. The error is likely due to missing KMS permissions. Option A is wrong because the --kms-key-id parameter is valid for Aurora clusters. Option C is wrong because the key exists; the issue is permissions. Option D is wrong because KMS keys can be used across regions if configured, but the error is more likely due to permissions.
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 IAM user does not have permission to use the specified KMS key
Why this is correct
Permission to use the KMS key is required.
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.
✗
The --kms-key-id parameter is not supported for aurora-mysql engine
Why it's wrong here
The parameter is supported for Aurora MySQL.
✗
The KMS key does not exist
Why it's wrong here
The key is specified as existing, but permissions may be missing.
✗
The KMS key is in a different region
Why it's wrong here
Cross-region KMS keys can be used, but the issue is likely permissions.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 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.
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM user does not have permission to use the specified KMS key — Option B is correct because the IAM role used to run the CLI command must have permission to use the specified KMS key. The error is likely due to missing KMS permissions. Option A is wrong because the --kms-key-id parameter is valid for Aurora clusters. Option C is wrong because the key exists; the issue is permissions. Option D is wrong because KMS keys can be used across regions if configured, but the error is more likely due to permissions.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 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.
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.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services 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 DBS-C01 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.