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Amazon DVA-C02 Sample Questions – Free Practice Test & Real Exam Prep
Question #1
A developer designed an application on an Amazon EC2 instance The application makesAPI requests to objects in an Amazon S3 bucketWhich combination of steps will ensure that the application makes the API requests in theMOST secure manner? (Select TWO.)
A. Create an IAM user that has permissions to the S3 bucket. Add the user to an 1AMgroup
B. Create an IAM role that has permissions to the S3 bucket
C. Add the IAM role to an instance profile. Attach the instance profile to the EC2 instance.
D. Create an 1AM role that has permissions to the S3 bucket Assign the role to an 1AMgroup
E. Store the credentials of the IAM user in the environment variables on the EC2 instance
Answer: B,C
Explanation: - Create an IAM role that has permissions to the S3 bucket. - Add the IAM
role to an instance profile. Attach the instance profile to the EC2 instance. We first need to
create a n IAM Role with permissions to read and eventually write a specific S3 bucket.
Then, we need to attach the role to the EC2 isntance through an instance profile. In this way, the ec2 instance has the permissions to read and eventually write the specified S3
bucket
Question #2
A developer is using AWS Step Functions to automate a workflow The workflow defineseach step as an AWS Lambda function task The developer notices that runs of the StepFunctions state machine fail in the GetResource task with either anUlegalArgumentException error or a TooManyRequestsException errorThe developer wants the state machine to stop running when the state machine encountersan UlegalArgumentException error. The state machine needs to retry the GetResourcetask one additional time after 10 seconds if the state machine encounters aTooManyRequestsException error. If the second attempt fails, the developer wants thestate machine to stop running.How can the developer implement the Lambda retry functionality without addingunnecessary complexity to the state machine'?
A. Add a Delay task after the GetResource task. Add a catcher to the GetResource task.Configure the catcher with an error type of TooManyRequestsException. Configure thenext step to be the Delay task Configure the Delay task to wait for an interval of 10 secondsConfigure the next step to be the GetResource task.
B. Add a catcher to the GetResource task Configure the catcher with an error type ofTooManyRequestsException. an interval of 10 seconds, and a maximum attempts value of1. Configure the next step to be the GetResource task.
C. Add a retrier to the GetResource task Configure the retrier with an error type ofTooManyRequestsException, an interval of 10 seconds, and a maximum attempts value of1.
D. Duplicate the GetResource task Rename the new GetResource task to TryAgain Add acatcher to the original GetResource task Configure the catcher with an error type ofTooManyRequestsException. Configure the next step to be TryAgain.
Answer: C
Explanation: The best way to implement the Lambda retry functionality is to use
the Retry field in the state definition of the GetResource task. The Retry field allows the
developer to specify an array of retriers, each with an error type, an interval, and a
maximum number of attempts. By setting the error type to TooManyRequestsException,
the interval to 10 seconds, and the maximum attempts to 1, the developer can achieve the
desired behavior of retrying the GetResource task once after 10 seconds if it encounters
a TooManyRequestsException error. If the retry fails, the state machine will stop running. If
the GetResource task encounters an UlegalArgumentException error, the state machine
will also stop running without retrying, as this error type is not specified in
the Retry field. References
Error handling in Step Functions
Handling Errors, Retries, and adding Alerting to Step Function State Machine
Executions
The Jitter Strategy for Step Functions Error Retries on the New Workflow Studio
Question #3
A developer creates a static website for their department The developer deploys the staticassets for the website to an Amazon S3 bucket and serves the assets with AmazonCloudFront The developer uses origin access control (OAC) on the CloudFront distributionto access the S3 bucketThe developer notices users can access the root URL and specific pages but cannotaccess directories without specifying a file name. For example, /products/index.html works,but /products returns an error The developer needs to enable accessing directories withoutspecifying a file name without exposing the S3 bucket publicly.Which solution will meet these requirements'?
A. Update the CloudFront distribution's settings to index.html as the default root object isset
B. Update the Amazon S3 bucket settings and enable static website hosting. Specify indexhtml as the Index document Update the S3 bucket policy to enable access. Update theCloudFront distribution's origin to use the S3 website endpoint
C. Create a CloudFront function that examines the request URL and appends index.htmlwhen directories are being accessed Add the function as a viewer request CloudFrontfunction to the CloudFront distribution's behavior.
D. Create a custom error response on the CloudFront distribution with the HTTP error codeset to the HTTP 404 Not Found response code and the response page path to /index htmlSet the HTTP response code to the HTTP 200 OK response code
Answer: A
Explanation: The simplest and most efficient way to enable accessing directories without
specifying a file name is to update the CloudFront distribution’s settings to index.html as
the default root object. This will instruct CloudFront to return the index.html object when a
user requests the root URL or a directory URL for the distribution. This solution does not
require enabling static website hosting on the S3 bucket, creating a CloudFront function, or
creating a custom error response. References
Specifying a default root object
cloudfront-default-root-object-configured
How to setup CloudFront default root object?
Ensure a default root object is configured for AWS Cloudfront …
Question #4
A company has an existing application that has hardcoded database credentials Adeveloper needs to modify the existing application The application is deployed in two AWSRegions with an active-passive failover configuration to meet company’s disaster recoverystrategyThe developer needs a solution to store the credentials outside the code. The solution mustcomply With the company's disaster recovery strategyWhich solution Will meet these requirements in the MOST secure way?
A. Store the credentials in AWS Secrets Manager in the primary Region. Enable secretreplication to the secondary Region Update the application to use the Amazon ResourceName (ARN) based on the Region.
B. Store credentials in AWS Systems Manager Parameter Store in the primary Region.Enable parameter replication to the secondary Region. Update the application to use theAmazon Resource Name (ARN) based on the Region.
C. Store credentials in a config file. Upload the config file to an S3 bucket in me primaryRegion. Enable Cross-Region Replication (CRR) to an S3 bucket in the secondary region.Update the application to access the config file from the S3 bucket based on the Region.
D. Store credentials in a config file. Upload the config file to an Amazon Elastic File System(Amazon EFS) file system. Update the application to use the Amazon EFS file systemRegional endpoints to access the config file in the primary and secondary Regions.
Answer: A
Explanation: AWS Secrets Manager is a service that allows you to store and manage
secrets, such as database credentials, API keys, and passwords, in a secure and
centralized way. It also provides features such as automatic secret rotation, auditing, and
monitoring1. By using AWS Secrets Manager, you can avoid hardcoding credentials in your
code, which is a bad security practice and makes it difficult to update them. You can also
replicate your secrets to another Region, which is useful for disaster recovery purposes2.
To access your secrets from your application, you can use the ARN of the secret, which is
a unique identifier that includes the Region name. This way, your application can use the
appropriate secret based on the Region where it is deployed3.
References:
AWS Secrets Manager
Replicating and sharing secrets
Using your own encryption keys
Question #5
A developer must use multi-factor authentication (MFA) to access data in an Amazon S3 bucket that is in another AWS account. Which AWS Security Token Service (AWS STS)API operation should the developer use with the MFA information to meet thisrequirement?
A. AssumeRoleWithWebidentity
B. GetFederationToken
C. AssumeRoleWithSAML
D. AssumeRole
Answer: D
Explanation: The AssumeRole API operation returns a set of temporary security
credentials that can be used to access resources in another AWS account. The developer
can specify the MFA device serial number and the MFA token code in the request
parameters. This option enables the developer to use MFA to access data in an S3 bucket
that is in another AWS account. The other options are not relevant or effective for this
scenario. References
AssumeRole
Requesting Temporary Security Credentials
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