This DVA-C02 practice question tests your understanding of development with aws services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 must share reusable validation code across several functions without packaging the same library into every deployment artifact. What should be used?
Lambda layer
Correct for the stated requirement.
API Gateway usage plan
Why wrong: This does not meet the stated requirement as directly as the correct option.
S3 multipart upload
Why wrong: This does not meet the stated requirement as directly as the correct option.
CloudWatch metric filter
Why wrong: This does not meet the stated requirement as directly as the correct option.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Lambda layer
Lambda layers allow you to centrally manage reusable code (e.g., validation libraries) and share it across multiple Lambda functions without packaging it into each deployment artifact. When you attach a layer to a function, the layer's content is extracted into the /opt directory, making it available at runtime. This avoids duplication and simplifies updates, as you only need to update the layer version rather than every function's deployment package.
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.
Lambda layer
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
API Gateway usage plan
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
S3 multipart upload
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
CloudWatch metric filter
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
The trap here is that candidates may confuse Lambda layers with other AWS services that handle 'sharing' (like API Gateway usage plans for sharing API access) or 'packaging' (like S3 multipart upload for large files), but only Lambda layers are designed to share code and dependencies across functions without repackaging.
Detailed technical explanation
Lambda layers are stored as ZIP archives in S3 and are extracted into /opt/{layer_name} at function invocation. The function's execution role must have permission to use the layer version (via the lambda:GetLayerVersion action). A common real-world scenario is sharing a common validation library (e.g., JWT verification or input sanitization) across dozens of microservices; updating the layer version automatically propagates the change to all functions that reference that layer version, but note that functions using $LATEST or a specific version number will not automatically pick up new layer versions unless you update the function configuration.
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.
What to study next
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FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: Lambda layer — Lambda layers allow you to centrally manage reusable code (e.g., validation libraries) and share it across multiple Lambda functions without packaging it into each deployment artifact. When you attach a layer to a function, the layer's content is extracted into the /opt directory, making it available at runtime. This avoids duplication and simplifies updates, as you only need to update the layer version rather than every function's deployment package.
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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