DVA-C02考試指南 & DVA-C02考題寶典

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最新的 AWS Certified Associate DVA-C02 免費考試真題 (Q64-Q69):

問題 #64
A developer is building a web application that uses Amazon API Gateway to expose an AWS Lambda function to process requests from clients. During testing, the developer notices that the API Gateway times out even though the Lambda function finishes under the set time limit.
Which of the following API Gateway metrics in Amazon CloudWatch can help the developer troubleshoot the issue? (Choose two.)

A. CacheHitCount
B. Latency
C. IntegrationLatency
D. CacheMissCount
E. Count

答案：B,C

解題說明：
Amazon API Gateway is a service that enables developers to create, publish, maintain, monitor, and secure APIs at any scale. Amazon CloudWatch is a service that monitors AWS resources and applications. API Gateway provides several CloudWatch metrics to help developers troubleshoot issues with their APIs. Two of the metrics that can help the developer troubleshoot the issue of API Gateway timing out are:
* IntegrationLatency: This metric measures the time between when API Gateway relays a request to the backend and when it receives a response from the backend. A high value for this metric indicates that the backend is taking too long to respond and may cause API Gateway to time out.
* Latency: This metric measures the time between when API Gateway receives a request from a client and when it returns a response to the client. A high value for this metric indicates that either the integration latency is high or API Gateway is taking too long to process the request or response.

問題 #65
An application that is hosted on an Amazon EC2 instance needs access to files that are stored in an Amazon S3 bucket. The application lists the objects that are stored in the S3 bucket and displays a table to the user.
During testing, a developer discovers that the application does not show any objects in the list.
What is the MOST secure way to resolve this issue?

A. Update the S3 bucket policy by including the S3:ListBucket permission and by setting the Principal element to specify the account number of the EC2 instance.
B. Update the developer's user permissions to include the S3:ListBucket permission for the S3 bucket.
C. Update the IAM instance profile that is attached to the EC2 instance to include the S3:ListBucket permission for the S3 bucket.
D. Update the IAM instance profile that is attached to the EC2 instance to include the S3:* permission for the S3 bucket.

答案：C

解題說明：
IAM instance profiles are containers for IAM roles that can be associated with EC2 instances. An IAM role is a set of permissions that grant access to AWS resources. An IAM role can be used to allow an EC2 instance to access an S3 bucket by including the appropriate permissions in the role's policy. The S3:ListBucket permission allows listing the objects in an S3 bucket. By updating the IAM instance profile with this permission, the application on the EC2 instance can retrieve the objects from the S3 bucket and display them to the user. Reference: Using an IAM role to grant permissions to applications running on Amazon EC2 instances

問題 #66
A developer is working on an AWS Lambda function that accesses Amazon DynamoDB. The Lambda function must retrieve an item and update some of its attributes, or create the item if it does not exist. The Lambda function has access to the primary key.
Which IAM permissions should the developer request for the Lambda function to achieve this functionality?
A)
B)
C)
D)

A. Option B
B. Option D
C. Option A
D. Option C

答案：A

解題說明：
Requirement Summary:
Lambda function:
Retrieves an item from DynamoDB
Updates its attributes or creates it if it does not exist
Has primary key
Needs minimum required IAM permissions
Analysis of Required Permissions:
To get an item and update it or create it if it doesn't exist, the Lambda function must use the **PutItem** or
**UpdateItem** API, and read with **GetItem**.
Valid API options:
GetItem: Read the item from the table.
UpdateItem: Update existing item attributes or insert if it doesn't exist (with UpdateExpression and ConditionExpression).
When UpdateItem is used without a conditional check for existence, it can create a new item if it does not exist (acts like upsert).
DescribeTable: (Optional) Used if you need table metadata (not strictly required here).
Evaluate the Choices:
Option A:
DeleteItem - Not needed
GetItem -
PutItem - (can create/replace but not partial update)
Close, but PutItem overwrites the full item, not update-in-place. Acceptable, but UpdateItem is better suited.
Option B:
UpdateItem - Required to modify attributes or insert new item
GetItem - Required to check existence or read data
DescribeTable - Optional, but not harmful
BEST FIT - Matches the update-or-create logic.
Option C:
GetRecords - This is used for DynamoDB Streams, not standard GetItem
PutItem -
UpdateTable - Used to change table settings, not data manipulation
Incorrect usage context
Option D:
UpdateItem, GetItem, PutItem - all valid
But UpdateItem alone is sufficient; including PutItem might not be necessary Also, image is faded (possibly invalid), and it's redundant UpdateItem API: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateItem.html PutItem vs UpdateItem: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide
/WorkingWithItems.html
IAM actions for DynamoDB: https://docs.aws.amazon.com/service-authorization/latest/reference
/list_amazondynamodb.html

問題 #67
A developer is using a user pool in Amazon Cognito to implement user sign-up functionality for an application. The developer wants to use an AWS Lambda function to automatically confirm known users during the sign-up process. The Lambda function will check users against existing user data. Which solution will meet these requirements with the LEAST operational overhead?

A. Implement a custom authentication flow that uses Lambda functions to validate user information and automatically confirm known users.
B. Configure the Lambda function as a PreSignUp trigger to check whether a user exists in the system before confirming.
C. Configure the Cognito user pool to invoke the Lambda function on the PostConfirmation event to confirm known users.
D. Use an AWS SDK in the Lambda function to confirm users by calling the AdminConfirmSignUp API after each user signs up.

答案：B

解題說明：
Using the PreSignUp trigger allows the Lambda function to automatically confirm users during the sign-up process before the user is created, minimizing operational overhead and avoiding additional confirmation steps after sign-up.

問題 #68
A developer is using AWS Elastic Beanstalk to deploy an application. The application must be able to access API keys from a third-party service. Currently, the company stores the credentials to access the third-party service in the code bundle. The company must redeploy the code bundle when the credentials rotate. The developer wants to improve security and avoid redeployments. Which solution will meet these requirements with the LEAST operational overhead?

A. Store the credentials as SecureString parameters in AWS Systems Manager Parameter Store. Reference the credentials in Elastic Beanstalk environment variables.
B. Continue to store the credentials in an encrypted file within the application bundle.
C. Use AWS KMS to encrypt the credentials locally. Configure Elastic Beanstalk to decrypt the credentials on startup.
D. Store the credentials in an Amazon S3 bucket. Configure server-side encryption with Amazon S3 managed keys (SSE-S3). Fetch the credentials at runtime.

答案：A

解題說明：
The standard best practice for Elastic Beanstalk is to externalize configuration using Environment Variables.
By storing sensitive API keys in SSM Parameter Store as a SecureString , you gain encryption and rotation capabilities. You then reference the parameter in the Elastic Beanstalk environment. The application can retrieve the value at runtime, and if the key is updated in Parameter Store, the application can pick up the change without needing a full code redeployment.

問題 #69
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DVA-C02考題寶典: https://www.kaoguti.com/DVA-C02_exam-pdf.html

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