高通過率的DVA-C02考試心得，最新的學習資料幫助妳壹次性通過DVA-C02考試

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>> DVA-C02考試心得 <<

高通過率的DVA-C02考試心得：AWS Certified Developer - Associate & 有效Amazon DVA-C02考古題介紹

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最新的 AWS Certified Associate DVA-C02 免費考試真題 (Q16-Q21):

問題 #16
A developer is designing a new feature for an existing application that uses an AWS Lambda function. The developer wants to test the Lambda function safely in development and testing AWS accounts before deploying the function to a production AWS account. The developer must be able to roll back the function if issues are discovered.
Which solution will meet these requirements with the LEAST operational overhead?

答案：C

解題說明：
AWS Lambda versions and aliases are designed specifically to support safe deployments, testing, and rollback. A Lambda version is immutable, meaning its code and configuration cannot change once published.
Aliases act as pointers to specific versions and can be updated instantly.
AWS documentation recommends using aliases to manage environments such as dev, test, and prod. Each environment can reference a specific Lambda version, allowing the same function codebase to be promoted across accounts with confidence. If a defect is detected in production, the alias can be quickly repointed to a previously known good version, enabling an immediate rollback without redeployment.
Options B, C, and D introduce higher operational overhead or do not provide safe rollback. Deploying separately increases risk and management effort. Lambda layers are not intended for environment promotion.
Environment variables do not protect against faulty code deployments.
Therefore, using Lambda versions and aliases is the most efficient and AWS-recommended solution.


問題 #17
A company launched an online portal to announce a new product that the company will release in 6 months.
The portal requests that users enter an email address to receive communications about the product. The company needs to create a REST API that will store the email addresses in Amazon DynamoDB.
A developer has created an AWS Lambda function that can store the email addresses. The developer will deploy the Lambda function by using the AWS Serverless Application Model (AWS SAM). The developer must provide access to the Lambda function over HTTP.
Which solutions will meet these requirements with the LEAST additional configuration? (Select TWO.)

答案：B,E


問題 #18
A developer is updating an Amazon API Gateway REST API to have a mock endpoint. The developer wants to update the integration request mapping template so the endpoint will respond to mock integration requests with specific HTTP status codes based on various conditions.

答案：D

解題說明：
Comprehensive Detailed Step by Step Explanation with All AWS Developer References:
In this scenario, the developer is configuring a mock integration in API Gateway. The integration request mapping template allows you to map the incoming request data to a format that the API expects. For mock integration, it's common to return specific HTTP status codes based on the conditions.
* Using $context.integration.status: The $context.integration.status variable refers to the status of the API Gateway integration, which is useful for generating responses based on the condition. Option D correctly uses this variable to determine the HTTP status code, returning 200 for a successful mock request or 500 for a failure.
* Alternatives:
* Options A, B, and C do not use the correct context variables for handling mock integrations.
These options would not return the correct status codes based on the actual integration status.
API Gateway Mapping Templates and Accessing Context Variables


問題 #19
A company uses a custom root certificate authority certificate chain (Root CA Cert) that is 10 KB in size generate SSL certificates for its on-premises HTTPS endpoints. One of the company's cloud based applications has hundreds of AWS Lambda functions that pull date from these endpoints. A developer updated the trust store of the Lambda execution environment to use the Root CA Cert when the Lambda execution environment is initialized. The developer bundled the Root CA Cert as a text file in the Lambdas deployment bundle.
After 3 months of development the root CA Cert is no longer valid and must be updated. The developer needs a more efficient solution to update the Root CA Cert for all deployed Lambda functions. The solution must not include rebuilding or updating all Lambda functions that use the Root CA Cert. The solution must also work for all development, testing and production environment. Each environment is managed in a separate AWS account.
When combination of steps Would the developer take to meet these environments MOST cost-effectively?
(Select TWO)

答案：A,E

解題說明：
This solution will meet the requirements by storing the Root CA Cert as a Secure String parameter in AWS Systems Manager Parameter Store, which is a secure and scalable service for storing and managing configuration data and secrets. The resource-based policy will allow IAM users in different AWS accounts and environments to access the parameter without requiring cross-account roles or permissions. The Lambda code will be refactored to load the Root CA Cert from the parameter store and modify the runtime trust store outside the Lambda function handler, which will improve performance and reduce latency by avoiding repeated calls to Parameter Store and trust store modifications for each invocation of the Lambda function.
Option A is not optimal because it will use AWS Secrets Manager instead of AWS Systems Manager Parameter Store, which will incur additional costs and complexity for storing and managing a non-secret configuration data such as Root CA Cert. Option C is not optimal because it will deactivate the application secrets and monitor the application error logs temporarily, which will cause application downtime and potential data loss. Option D is not optimal because it will modify the runtime trust store inside the Lambda function handler, which will degrade performance and increase latency by repeating unnecessary operations for each invocation of the Lambda function.
References: AWS Systems Manager Parameter Store, [Using SSL/TLS to Encrypt a Connection to a DB Instance]


問題 #20
A company has an ecommerce application. To track product reviews, the company's development team uses an Amazon DynamoDB table.
Every record includes the following
* A Review ID a 16-digrt universally unique identifier (UUID)
* A Product ID and User ID 16 digit UUlDs that reference other tables
* A Product Rating on a scale of 1-5
* An optional comment from the user
The table partition key is the Review ID. The most performed query against the table is to find the 10 reviews with the highest rating for a given product.
Which index will provide the FASTEST response for this query"?

答案：D

解題說明：
Explanation
This solution allows the fastest response for the query because it enables the query to use a single partition key value (the Product ID) and a range of sort key values (the Product Rating) to find the matching items. A global secondary index (GSI) is an index that has a partition key and an optional sort key that are different from those on the base table. A GSI can be created at any time and can be queried or scanned independently of the base table. A local secondary index (LSI) is an index that has the same partition key as the base table, but a different sort key. An LSI can only be created when the base table is created and must be queried together with the base table partition key. Using a GSI with Product ID as the partition key and Review ID as the sort key will not allow the query to use a range of sort key values to find the highest ratings. Using an LSI with Product ID as the partition key and Product Rating as the sort key will not work because Product ID is not the partition key of the base table. Using an LSI with Review ID as the partition key and Product ID as the sort key will not allow the query to use a single partition key value to find the matching items.


問題 #21
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