This DVA-C02 practice question tests your understanding of security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 Lambda function needs to decrypt data encrypted with a customer managed KMS key. Which two permissions are commonly required?
kms:Decrypt on the key
Correct for the stated requirement.
iam:CreateUser on the account
Why wrong: This does not meet the stated requirement as directly as the correct option.
s3:PutBucketAcl on every bucket
Why wrong: This does not meet the stated requirement as directly as the correct option.
Permission for the Lambda execution role to use the KMS key
Correct for the stated requirement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kms:Decrypt on the key
Option A is correct because the Lambda function must have permission to call the kms:Decrypt action on the specific customer managed KMS key to decrypt the data. This permission is granted via a key policy or a grant on the KMS key itself, allowing the Lambda execution role to use the key for decryption operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
kms:Decrypt on the key
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
iam:CreateUser on the account
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
s3:PutBucketAcl on every bucket
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Permission for the Lambda execution role to use the KMS key
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse IAM actions (like iam:CreateUser or s3:PutBucketAcl) with KMS-specific permissions, or they forget that the Lambda execution role needs both the IAM policy and the key policy to allow kms:Decrypt.
Detailed technical explanation
Under the hood, KMS uses key policies and IAM policies to control access; the Lambda execution role must be listed as a principal in the key policy or have a grant that allows kms:Decrypt. A common subtlety is that the key policy must explicitly allow the Lambda execution role, or the role must have an IAM policy that allows kms:Decrypt on the key ARN, and the key policy must not explicitly deny it. In real-world scenarios, if the key is in a different AWS account, a cross-account key policy is required, and the Lambda role must also have the kms:Decrypt permission.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: kms:Decrypt on the key — Option A is correct because the Lambda function must have permission to call the kms:Decrypt action on the specific customer managed KMS key to decrypt the data. This permission is granted via a key policy or a grant on the KMS key itself, allowing the Lambda execution role to use the key for decryption operations.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DVA-C02 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 DVA-C02 exam.
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