This DVA-C02 practice question tests your understanding of deployment. 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 developer is deploying a new version of a Lambda function using the AWS CLI. The function is part of a serverless application that processes S3 events. The developer wants to ensure that the new version is production-ready and that the old version is still available for rollback. Which CLI command should the developer use to create a new version of the Lambda function?
Option A is correct because the `aws lambda publish-version` command creates an immutable, versioned snapshot of the Lambda function's code and configuration, which is required for production-ready deployments. This ensures the old version remains available for rollback while the new version is published with a unique version number (e.g., $LATEST, 1, 2). The command explicitly publishes the current $LATEST version as a new numbered version, making it production-ready without affecting existing versions.
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.
This creates a new function, not a version of an existing function.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse deploying code with `update-function-code` (which only updates $LATEST) with publishing a new version, assuming that any code update automatically creates a version; in reality, you must explicitly run `publish-version` to create an immutable, numbered version for production use and rollback.
Detailed technical explanation
How to think about this question
Under the hood, Lambda versions are immutable snapshots that include both the code and configuration (e.g., IAM role, timeout, environment variables). When you publish a version, Lambda assigns a unique ARN (e.g., `arn:aws:lambda:us-east-1:123456789012:function:my-function:1`) and increments the version number. This allows you to use aliases (e.g., `prod`) to point to a specific version and easily roll back by updating the alias to a previous version. A real-world scenario is deploying a new version with updated code via `update-function-code`, then running `publish-version` to make it production-ready while keeping version 1 for rollback.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: aws lambda publish-version --function-name my-function — Option A is correct because the `aws lambda publish-version` command creates an immutable, versioned snapshot of the Lambda function's code and configuration, which is required for production-ready deployments. This ensures the old version remains available for rollback while the new version is published with a unique version number (e.g., $LATEST, 1, 2). The command explicitly publishes the current $LATEST version as a new numbered version, making it production-ready without affecting existing versions.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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