The answer is that the external schema does not have the IAM role specified. This is the most likely cause because when Redshift Spectrum queries data in S3 encrypted with SSE-KMS, the IAM role must be explicitly associated with the external schema using the `IAM_ROLE` parameter in the `CREATE EXTERNAL SCHEMA` command. Even if the Redshift cluster itself has the correct IAM role attached, Spectrum fails with an 'Access Denied' error if that role isn't declared at the schema level, as Redshift needs to pass the role to both S3 and KMS for each query execution. On the AWS Certified Data Engineer Associate DEA-C01 exam, this tests your understanding of how Redshift Spectrum handles cross-service permissions, and the common trap is assuming the cluster-level role is sufficient. Remember the memory tip: "Schema role, not cluster role" — the external schema must explicitly name the IAM role for Spectrum to access KMS-encrypted data.
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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.
A company is using Amazon Redshift Spectrum to query data in Amazon S3. The S3 bucket uses SSE-KMS encryption. The Redshift cluster has an IAM role that allows access to S3 and KMS. However, queries fail with an 'Access Denied' error. What is the most likely cause?
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 external schema does not have the IAM role specified.
When using Redshift Spectrum with SSE-KMS encrypted data in S3, the IAM role must be explicitly associated with the external schema via the `CREATE EXTERNAL SCHEMA` command using the `IAM_ROLE` parameter. Even if the cluster has the IAM role attached, Spectrum queries fail with 'Access Denied' if the role is not specified at the schema level, because Redshift needs to pass that role to S3 and KMS for each query execution. Option B correctly identifies this missing configuration as the most likely cause.
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 Redshift cluster does not have the IAM role attached.
Why it's wrong here
If attached, the cluster can use the role, but the schema still needs it.
✓
The external schema does not have the IAM role specified.
Why this is correct
The schema must reference the IAM role for Redshift Spectrum to assume it.
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 IAM role does not have the kms:Decrypt permission.
Why it's wrong here
The role likely has the permission, but the schema is not using the role.
✗
The external table is not defined in the schema.
Why it's wrong here
The table exists but the schema lacks the role.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume attaching an IAM role to the Redshift cluster is sufficient for all Spectrum operations, but the DEA-C01 exam tests the specific requirement that the role must be declared in the external schema definition for Spectrum to use it.
Detailed technical explanation
How to think about this question
Under the hood, Redshift Spectrum uses the IAM role specified in the external schema to assume a role for accessing S3 and KMS. If the role is not specified, Redshift attempts to use the cluster's default role, but Spectrum requires explicit role association per schema to enforce least-privilege access. In real-world scenarios, this often happens when teams attach roles to the cluster but forget to update the external schema definition, especially after rotating or replacing IAM roles.
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.
TExam Day Tips
→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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The external schema does not have the IAM role specified. — When using Redshift Spectrum with SSE-KMS encrypted data in S3, the IAM role must be explicitly associated with the external schema via the `CREATE EXTERNAL SCHEMA` command using the `IAM_ROLE` parameter. Even if the cluster has the IAM role attached, Spectrum queries fail with 'Access Denied' if the role is not specified at the schema level, because Redshift needs to pass that role to S3 and KMS for each query execution. Option B correctly identifies this missing configuration as the most likely cause.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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Question Discussion
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