DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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. A key principle to apply: sAM policy templates simplify IAM role creation for Lambda functions.. 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 developer is building a serverless application using AWS SAM. The application includes a Lambda function that needs read-only access to an S3 bucket. The developer wants to use SAM's built-in policy templates to grant this permission. Which policy template should be used in the SAM template?
This template grants read-only permissions (s3:GetObject, s3:ListBucket) to the specified bucket.
B
S3CrudPolicy
Why wrong: This template grants create, read, update, delete permissions, which is more than read-only.
C
S3FullAccessPolicy
Why wrong: This template grants full access, which is excessive for read-only requirements.
D
S3StreamPolicy
Why wrong: This template is for reading from an S3 bucket using Lambda event source mappings with a stream-like interface, not for general read-only access.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3ReadPolicy
The S3ReadPolicy template is the correct choice because it grants read-only access to an S3 bucket, which aligns with the requirement for the Lambda function. AWS SAM provides this built-in IAM policy template to simplify attaching least-privilege permissions, specifically allowing s3:GetObject, s3:ListBucket, and similar read operations.
Key principle: SAM policy templates simplify IAM role creation for Lambda functions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
S3ReadPolicy
Why this is correct
This template grants read-only permissions (s3:GetObject, s3:ListBucket) to the specified bucket.
Related concept
SAM policy templates simplify IAM role creation for Lambda functions.
✗
S3CrudPolicy
Why it's wrong here
This template grants create, read, update, delete permissions, which is more than read-only.
✗
S3FullAccessPolicy
Why it's wrong here
This template grants full access, which is excessive for read-only requirements.
✗
S3StreamPolicy
Why it's wrong here
This template is for reading from an S3 bucket using Lambda event source mappings with a stream-like interface, not for general read-only access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse S3CrudPolicy with read-only access, but CRUD implies full data manipulation (create, read, update, delete), which is more permissive than the required read-only scope.
Detailed technical explanation
How to think about this question
Under the hood, SAM policy templates are shorthand for IAM policy documents that are expanded during deployment. The S3ReadPolicy template generates a policy with actions like s3:GetObject, s3:ListBucket, and s3:GetObjectVersion, scoped to the specified bucket ARN. This is critical for serverless applications where over-permissioning can lead to security vulnerabilities, and SAM enforces this by mapping the template name to a predefined policy document in the SAM specification.
KKey Concepts to Remember
SAM policy templates simplify IAM role creation for Lambda functions.
`S3ReadPolicy` grants `s3:GetObject` and `s3:ListBucket` permissions to an S3 bucket.
It adheres to the principle of least privilege for S3 read access.
Policy templates are defined under the `Policies` property of a `AWS::Serverless::Function` resource.
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
SAM policy templates simplify IAM role creation for Lambda functions.
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.
Review sAM policy templates simplify IAM role creation for Lambda functions., then practise related DVA-C02 questions on the same topic to reinforce the concept.
Development with AWS Services — This question tests Development with AWS Services — SAM policy templates simplify IAM role creation for Lambda functions..
What is the correct answer to this question?
The correct answer is: S3ReadPolicy — The S3ReadPolicy template is the correct choice because it grants read-only access to an S3 bucket, which aligns with the requirement for the Lambda function. AWS SAM provides this built-in IAM policy template to simplify attaching least-privilege permissions, specifically allowing s3:GetObject, s3:ListBucket, and similar read operations.
What should I do if I get this DVA-C02 question wrong?
Review sAM policy templates simplify IAM role creation for Lambda functions., then practise related DVA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
SAM policy templates simplify IAM role creation for Lambda functions.
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