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Q1. A developer is building a backend system for the long-term storage of information from an inventory management system. The information needs to be stored so that other teams can build tools to report and analyze the data. How should the developer implement this solution to achieve the FASTEST running time?

A. Create an AWS Lambda function that writes to Amazon S3 synchronously Increase the function\\’s concurrency to match the highest expected value of concurrent scans and requests.
B. Create an AWS Lambda function that writes to Amazon S3 asynchronously Configure a dead-letter queue to collect unsuccessful invocations
C. Create an AWS Lambda function that writes to Amazon S3 synchronously Set the inventory system to retry failed requests.
D. Create an AWS Lambda function that writes to an Amazon ElastiCache for the Redis cluster asynchronously Configure a dead-letter queue to collect unsuccessful invocations.

Correct Answer: A

Q2. A developer is working on a serverless application that needs to process any changes to an Amazon DynamoDB table with an AWS Lambda function. How should the developer configure the Lambda function to detect changes to the DynamoDB table?

A. Create an Amazon Kinesis data stream, and attach it to the DynamoDB table. Create a trigger to connect the data stream to the Lambda function.
B. Create an Amazon EventBridge (Amazon CloudWatch Events) rule to invoke the Lambda function on a regular schedule. Connect to the DynamoDB table from the Lambda function to detect changes.
C. Enable DynamoDB Streams on the table. Create a trigger to connect the DynamoDB stream to the Lambda function.
D. Create an Amazon Kinesis Data Firehose delivery stream, and attach it to the DynamoDB table. Configure the delivery stream destination as the Lambda function.

Correct Answer: C

Reference: https://aws.amazon.com/getting-started/projects/build-serverless-web-app-lambda-apigateways3-dynamodbcognito/module-3/

Q3. A company is using Amazon API Gateway to manage its public-facing API. The CISO requires that the APIs be used by test account users only. What is the MOST secure way to restrict API access to users of this particular AWS account?

A. Client-side SSL certificates for authentication
B. API Gateway resource policies
C. Cross-origin resource sharing (CORS)
D. Usage plans

Correct Answer: B

Reference: https://aws.amazon.com/blogs/compute/control-access-to-your-apis-using-amazon-apigateway-resourcepolicies/

Q4. A Developer has an application that must accept a large number of incoming data streams and process the data before sending it to many downstream users. Which serverless solution should the Developer use to meet these requirements?

A. Amazon RDS MySQL stored procedure with AWS Lambda
B. AWS Direct Connect with AWS Lambda
C. Amazon Kinesis Data Streams with AWS Lambda
D. Amazon EC2 bash script with AWS Lambda

Correct Answer: C

Reference: https://aws.amazon.com/kinesis/data-analytics/faqs/

Q5. A developer is using Amazon S3 as the event source that invokes a Lambda function when new objects are created in the bucket. The event source mapping information is stored in the bucket notification configuration.
The developer is working with different versions of the Lambda function and has a constant need to update notification configuration so that Amazon S3 invokes the correct version. What is the MOST efficient and effective way to achieve mapping between the S3 event and Lambda?

A. Use a different Lambda trigger.
B. Use Lambda environment variables.
C. Use a Lambda alias.
D. Use Lambda tags.

Correct Answer: A

Reference: https://aws.amazon.com/premiumsupport/knowledge-center/lambda-s3-event-configurationerror/

Q6. A company\\’s fleet of Amazon EC2 instances receives data from millions of users through an API. The servers batch the data, add an object for each user, and upload the objects to an S3 bucket to ensure high access rates.
The object attributes are Customer ID, Server ID, TS-Server (TimeStamp and Server ID), the size of the object, and a timestamp. A developer wants to find all the objects for a given user collected during a specified time range. After creating an S3 object-created event, how can the Developer achieve this requirement?

A. Execute an AWS Lambda function in response to the S3 object creation events that create an Amazon DynamoDB record for every object with the Customer ID as the partition key and the Server ID as the sort key. Retrieve all the records using the Customer ID and Server ID attributes.

B. Execute an AWS Lambda function in response to the S3 object creation events that create an Amazon Redshift record for every object with the Customer ID as the partition key and TS-Server as the sort key. Retrieve all the records using the Customer ID and TS-Server attributes.

C. Execute an AWS Lambda function in response to the S3 object creation events that create an Amazon DynamoDB record for every object with the Customer ID as the partition key and TS-Server as the sort key. Retrieve all the records using the Customer ID and TS-Server attributes.

D. Execute an AWS Lambda function in response to the S3 object creation events that create an Amazon Redshift record for every object with the Customer ID as the partition key and the Server ID as the sort key. Retrieve all the records using the Customer ID and Server ID attributes.

Correct Answer: C

Q7. A developer wants to secure sensitive configuration data such as passwords, database strings, and application license codes. Access to this sensitive information must be tracked for future audit purposes. Where should the sensitive information be stored, adhering to security best practices and operational requirements?

A. In an encrypted file on the source code bundle; grant the application access with Amazon IAM
B. In the Amazon EC2 Systems Manager Parameter Store; grant the application access with IAM
C. On an Amazon EBS encrypted volume; attach the volume to an Amazon EC2 instance to access the data
D. As an object in an Amazon S3 bucket; grant an Amazon EC2 instance access with an IAM role

Correct Answer: B
Reference: https://aws.amazon.com/blogs/security/how-to-enhance-the-security-of-sensitive-customerdata-by-usingamazon-cloudfront-field-level-encryption/

Q8. A Developer is migrating existing applications to AWS. These applications use MongoDB as their primary data store, and they will be deployed to Amazon EC2 instances. Management requires that the Developer minimize changes to applications while using AWS services. Which solution should the Developer use to host MongoDB in AWS?

A. Install MongoDB on the same instance where the application is running.
B. Deploy Amazon DocumentDB in MongoDB compatibility mode.
C. Use Amazon API Gateway to translate API calls from MongoDB to Amazon DynamoDB.
D. Replicate the existing MongoDB workload to Amazon DynamoDB.

Correct Answer: D

Q9. An application development team decides to use AWS X-Ray to monitor application code to analyze performance and perform r cause analysis What does the team need to do to begin using X-Ray? (Select TWO )

A. Log instrumentation output into an Amazon SQS queue
B. Use a visualization tool to view application traces
C. Instrument application code using the AWS SDK
D. Install the X-Ray agent on the application servers
E. Create an Amazon DynamoDB table to store the trace logs

Correct Answer: DE

Q10. A Lambda function is packaged for deployment to multiple environments, including development, test, production, etc. Each environment has a unique set of resources such as databases, etc. How can the Lambda function use the resources for the current environment?

A. Apply tags to the Lambda functions.
B. Hardcore resources in the source code.
C. Use environment variables for the Lambda functions.
D. Use a separate function for development and production.

Correct Answer: C

Q11. A developer is creating a serverless web application and maintains different branches of code. The developer wants to avoid updating the Amazon API Gateway target endpoint each time a new code push is performed. What solution would allow the developer to perform a code push efficiently, without the need to update the API Gateway?

A. Associate different AWS Lambda functions to an API Gateway target endpoint.
B. Create different stages in API Gateway, then associate API Gateway with AWS Lambda.
C. Create aliases and versions in AWS Lambda.
D. Tag the AWS Lambda functions with different names.

Correct Answer: C

Q12. A company is adding items to an Amazon DynamoDB table from an AWS Lambda function that is written in Python. A developer needs to implement a solution that inserts records in the DynamoDB table and performs an automatic retry when the insert fails. Which solution meets these requirements with MINIMUM code changes?

A. Configure the Python code to run the AWS CLI through the shell to call the PutItem operation
B. Call the PutItem operation from Python by using the DynamoDB HTTP API
C. Queue the items in AWS Glue, which will put them into the DynamoDB table
D. Use the AWS software development kit (SDK) for Python (boto3) to call the PutItem operation

Correct Answer: D

Reference: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ GettingStarted.Python.html

Q13. In a move toward using microservices, a company\’s Management team has asked all Development teams to build their services so that API requests depend only on that service\’s data store. One team is building a Payments service that has its own database; the service needs data that originates in the Accounts database. Both are using Amazon
DynamoDB.
What approach will result in the simplest, decoupled, and most reliable method to get near-real-time updates from the Accounts database?

A. Use Amazon Glue to perform frequent ETL updates from the Accounts database to the Payments database.
B. Use Amazon ElastiCache in Payments, with the cache updated by triggers in the Accounts database.
C. Use Amazon Kinesis Data Firehouse to deliver all changes from the Accounts database to the Payments database.
D. Use Amazon DynamoDB Streams to deliver all changes from the Accounts database to the Payments database.

Correct Answer: D

Reference:
https://aws.amazon.com/blogs/database/how-to-perform-ordered-data-replication- between applications-by using amazon-dynamodb-streams/

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[2022 latest] Aws certified developer–associate (dva-c01) dumps practice questions 1-12:

Q 1

An application that is deployed to Amazon EC2 is using Amazon DynamoDB. The application calls the DynamoDB REST API. Periodically, the application receives a ProvisionedThroughputExceededException error when the application writes to a DynamoDB table.
Which solutions will mitigate this error MOST cost-effectively? (Choose two.)

A. Modify the application code to perform exponential backoff when the error is received.
B. Modify the application to use the AWS SDKs for DynamoDB.
C. Increase the read and write throughput of the DynamoDB table.
D. Create a DynamoDB Accelerator (DAX) cluster for the DynamoDB table.
E. Create a second DynamoDB table. Distribute the reads and writes between two tables.

Reference: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ Programming.Errors.html

Q 2

An application reads data from an Amazon DynamoDB table. Several times a day, for a period of 15 seconds, the application receives multiple ProvisionedThroughputExceeded errors.
How should this exception be handled?

A. Create a new global secondary index for the table to help with the additional requests.
B. Retry the failed read requests with exponential backoff.
C. Immediately retry the failed read requests.
D. Use the DynamoDB “UpdateItem” API to increase the provisioned throughput capacity of the table.

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html

Q 3

A company is launching a new web application in the AWS Cloud. The company\’s development team is using AWS Elastic Beanstalk for deployment and maintenance. According to the company\’s change management process, the development team must evaluate changes for a specific time period before completing the rollout.

Which deployment policy meets this requirement?

A. Immutable
B. Rolling
C. Rolling with additional batch
D. Traffic splitting

Q 4

A development team is migrating a monolithic application to Amazon API Gateway with AWS Lambda integrations using the AWS CD The zip deployment package exceeds the Lambda direct upload deployment package size limit. How should the Lambda function be deployed?

A. Use the zip tile to create a Lambda layer and reference it using the -code CLI parameter
B. Create a Docker image and reference the image using the –docker-image CLI parameter
C. Upload a deployment package using the –zp-file CLI parameter
D. Upload a deployment package to Amazon S3 and reference Amazon S3 using the — code CLI parameter

Q 5

An Amazon S3 bucket, “myawsbucket” is configured with website hosting in Tokyo region, what is the region-specific website endpoint?

A. www.myawsbucket.ap-northeast-1.amazonaws.com
B. myawsbucket.s3-website-ap-northeast-1.amazonawscom
C. myawsbucket.amazonaws.com
D. myawsbucket.tokyo.amazonaws.com

Depending on your Region, your Amazon S3 website endpoint follows one of these two formats. s3-website dash (-) Region – http://bucket-name.s3-website-Region.amazonaws.com s3-website dot (.) Region – http://bucketname.s3-website.Region.amazonaws.com https://docs.aws.amazon.com/AmazonS3/latest/dev/WebsiteEndpoints.html

Q 6

An application overwrites an object in Amazon S3, and then immediately reads the same object. Why would the application sometimes retrieve the old version of the object?

A. S3 overwrite PUTS are eventually consistent, so the application may read the old object.
B. The application needs to add extra metadata to label the latest version when uploading to Amazon S3.
C. All S3 PUTS are eventually consistent, so the application may read the old object.
D. The application needs to explicitly specify latest version when retrieving the object.

Q 7

An organization is using Amazon CloudFront to ensure that its users experience low-latency access to its web application. The organization has identified a need to encrypt all traffic between users and CloudFront, and all traffic between CloudFront and the web application.

How can these requirements be met? (Choose two.)

A. Use AWS KMS to encrypt traffic between CloudFront and the web application.
B. Set the Origin Protocol Policy to “HTTPS Only”.
C. Set the Origin\\’s HTTP Port to 443.
D. Set the Viewer Protocol Policy to “HTTPS Only” or “Redirect HTTP to HTTPS”.
E. Enable the CloudFront option Restrict Viewer Access.

https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/using-https-viewers-tocloudfront.html
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/using-https-cloudfront-to-customorigin.html

Q 8

A company runs continuous integration/continuous delivery (CI/CD) pipeline for its application on AWS CodePipeline. A developer must write unit tests and run them as part of the pipelines before staging the artifacts for testing.
How should the Developer incorporate unit tests as part of CI/CD pipeline?

A. Create a separate codePipline pipline to run unit tests.
B. Update the AWS codeBuild build specification to include a phase for running unit tests.
C. Install the AWS CodeDeploy agent on an Amazon EC2 instance to run unit tests.
D. Create a testing branch in AWS CodeCommit to run unit tests.

Q 9

An application uses Amazon DynamoDB as its backend database The application experiences sudden spikes in traffic over the weekend and variable but predictable spikes during weekdays The capacity needs to be set to avoid throttling errors at all times.

How can this be accomplished cost-effectively?

A. Use provisioned capacity with AWS Auto Scaling throughout the week.
B. Use on-demand capacity for the weekend and provisioned capacity with AWS Auto Scaling during the weekdays
C. Use on-demand capacity throughout the week
D. Use provisioned capacity with AWS Auto Scaling enabled during the weekend and reserved capacity enabled during the weekdays

Q 10

Which features can be used to restrict access to data in S3? Choose 2 answers

A. Use S3 Virtual Hosting
B. Set an S3 Bucket policy.
C. Enable IAM Identity Federation.
D. Set an S3 ACL on the bucket or the object.
E. Create a CloudFront distribution for the bucket

https://aws.amazon.com/premiumsupport/knowledge-center/secure-s3-resources/

Q 11

How can you secure data at rest on an EBS volume?

A. Attach the volume to an instance using EC2\\’s SSL interface.
B. Write the data randomly instead of sequentially.
C. Use an encrypted file system on top of the BBS volume.
D. Encrypt the volume using the S3 server-side encryption service.
E. Create an IAM policy that restricts read and write access to the volume.

Q 12

A company is using Amazon API Gateway to manage access to a set of microservices implemented as AWS Lambda functions. Following a bug report, the company makes a minor breaking change to one of the APIs.

In order to avoid impacting existing clients when the new API is deployed, the company wants to allow clients six months to migrate from v1 to v2.

Which approach should the Developer use to handle this change?

A. Update the underlying Lambda function and provide clients with the new Lambda invocation URL.
B. Use API Gateway to automatically propagate the change to clients, specifying 180 days in the phased deployment parameter.
C. Use API Gateway to deploy a new stage named v2 to the API and provide users with its URL.
D. Update the underlying Lambda function, create an Amazon CloudFront distribution with the updated Lambda function as its origin.

Post correct answer

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QUESTION 1

An application has the following requirements:

1. Performance efficiency of seconds with up to a minute of latency.
2. The data storage size may grow up to thousands of terabytes.
3. Per-message sizes may vary between 100 KB and 100 MB.
4. Data can be stored as key/value stores supporting eventual consistency.

What is the MOST cost-effective AWS service to meet these requirements?

A. Amazon DynamoDB
B. Amazon S3
C. Amazon RDS (with a MySQL engine)
D. Amazon ElastiCache

Correct Answer: A

Reference: https://aws.amazon.com/nosql/key-value/

QUESTION 2

A developer is building an application that processes a stream of user-supplied data. The data stream must be consumed by multiple Amazon EC2 based processing applications in parallel and in real time. Each processor must be able to resume without losing data if there is a service interruption.

The Application Architect plans to add other processors in the near future, and wants to minimize the amount data duplication involved.

Which solution will satisfy these requirements?

A. Publish the data to Amazon SQS.
B. Publish the data to Amazon Kinesis Data Firehose.
C. Publish the data to Amazon CloudWatch Events.
D. Publish the data to Amazon Kinesis Data Streams.

Correct Answer: D

Reference: https://aws.amazon.com/kinesis/data-streams/faqs/

QUESTION 3

A Developer has an application that can upload tens of thousands of objects per second to Amazon S3 in parallel within a single AWS account. As part of new requirements, data stored in S3 must use server side encryption with AWS KMS (SSE-KMS). After creating this change, performance of the application is slower.

Which of the following is MOST likely the cause of the application latency?

A. Amazon S3 throttles the rate at which uploaded objects can be encrypted using Customer Master Keys.
B. The AWS KMS API calls limit is less than needed to achieve the desired performance.
C. The client encryption of the objects is using a poor algorithm.
D. KMS requires that an alias be used to create an independent display name that can be mapped to a CMK.

Correct Answer: B

https://aws.amazon.com/about-aws/whats-new/2018/08/aws-key-management-service-increases-apirequests-persecond-limits/

KMS API access limit is 10k/sec in us-east and some others and 5.5k/sec for the rest of the regions. Client can request this limit to be changed.

QUESTION 4

A legacy service has an XML-based SOAP interface. The Developer wants to expose the functionality of the service to external clients with the Amazon API Gateway. Which technique will accomplish this?

A. Create a RESTful API with the API Gateway; transform the incoming JSON into a valid XML message for the SOAP interface using mapping templates.
B. Create a RESTful API with the API Gateway; pass the incoming JSON to the SOAP interface through an Application Load Balancer.
C. Create a RESTful API with the API Gateway; pass the incoming XML to the SOAP interface through an Application Load Balancer.
D. Create a RESTful API with the API Gateway; transform the incoming XML into a valid message for the SOAP interface using mapping templates.

Correct Answer: A

https://blog.codecentric.de/en/2016/12/serverless-soap-legacy-api-integration-java-aws-lambda-aws-apigateway/

QUESTION 5

A Developer decides lo store highly secure data in Amazon S3 and wants to implement server-side encryption (SSF) with granular control of who can access the master key Company policy requires that the master key be created, rotated, and disabled easily when needed, all for security reasons. Which solution should be used to moot these requirements?

A. SSE with Amazon S3 managed keys (SSE-S3)
B. SSFE with AWS KMS managed keys (SSE KMS)
C. SSE with AWS Secrets Manager
D. SSE with customer provided encryption keys

Correct Answer: B

QUESTION 6

A Developer must trigger an AWS Lambda function based on the item lifecycle activity in an Amazon DynamoDB table.
How can the Developer create the solution?

A. Enable a DynamoDB stream that publishes an Amazon SNS message. Trigger the Lambda function synchronously from the SNS message.
B. Enable a DynamoDB stream that publishes an SNS message. Trigger the Lambda function asynchronously from the SNS message.
C. Enable a DynamoDB stream, and trigger the Lambda function synchronously from the stream.
D. Enable a DynamoDB stream, and trigger the Lambda function asynchronously from the stream.

Correct Answer: C

https://docs.aws.amazon.com/lambda/latest/dg/with-ddb.html

QUESTION 7

A developer is building an application that will run on Amazon EC2 instances. The application needs to connect to an Amazon DynamoDB table to read and write records. The security team must periodically rotate access keys.

Which approach will satisfy these requirements?

A. Create an IAM role with read and write access to the DynamoDB table. Generate access keys for the user and store the access keys in the application as environment variables.
B. Create an IAM user with read and write access to the DynamoDB table. Store the user name and password in the application and generate access keys using an AWS SDK.
C. Create an IAM role, configure read and write access for the DynamoDB table, and attach to the EC2 instances.
D. Create an IAM user with read and write access to the DynamoDB table. Generate access keys for the user and store the access keys in the application as a credentials file.

Correct Answer: D

QUESTION 8

A photo sharing website gets millions of new images every week The images are stored in Amazon S3 under a formatted date prefix A developer wants to move images to a few S3 buckets for analysis and further processing Images are not required to be moved in real time What is the MOST efficient method for performing this task?

A. Use S3 PutObject events to Invoke AWS Lambda Then Lambda will copy the files to the other objects
B. Create an AWS Lambda function that will pull a day of Images from the origin bucket and copy them to the other buckets.
C. Use S3 Batch Operations to create jobs for images to be copied to each Individual bucket.
D. Use Amazon EC2 to batch pull images from multiple days and copy them to the other buckets

Correct Answer: D

QUESTION 9

A Developer is building a serverless application using AWS Lambda and must create a REST API using an HTTP GET method.
What needs to be defined to meet this requirement? (Choose two.)

A. A [email protected] function
B. An Amazon API Gateway with a Lambda function
C. An exposed GET method in an Amazon API Gateway
D. An exposed GET method in the Lambda function
E. An exposed GET method in Amazon Route 53

Correct Answer: BC

Reference: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-getting-startedwith-restapis.html

QUESTION 10

A Developer is writing a mobile application that allows users to view images from an S3 bucket. The users must be able to log in with their Amazon login, as well as Facebook?and/or Google?accounts.
How can the Developer provide this authentication functionality?

A. Use Amazon Cognito with web identity federation.
B. Use Amazon Cognito with SAML-based identity federation.
C. Use AWS IAM Access/Secret keys in the application code to allow Get* on the S3 bucket.
D. Use AWS STS AssumeRole in the application code and assume a role with Get* permissions on the S3 bucket.

Correct Answer: A

QUESTION 11

The upload of a 15 GB object to Amazon S3 fails. The error message reads: “Your proposed upload exceeds the maximum allowed object size.”
What technique will allow the Developer to upload this object?

A. Upload the object using the multi-part upload API.
B. Upload the object over an AWS Direct Connect connection.
C. Contact AWS Support to increase the object size limit.
D. Upload the object to another AWS region.

Correct Answer: A

https://docs.aws.amazon.com/AmazonS3/latest/dev/UploadingObjects.html

QUESTION 12

A Developer is receiving HTTP 400: ThrottlingException errors intermittently when calling the Amazon
CloudWatch API. When a call fails, no data is retrieved.
What best practice should first be applied to address this issue?

A. Contact AWS Support for a limit increase.
B. Use the AWS CLI to get the metrics
C. Analyze the applications and remove the API call
D. Retry the call with exponential backoff

Correct Answer: A

https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_limits.html

QUESTION 13

A company requires that AWS Lambda functions written by developers log errors so system administrators can more effectively troubleshoot issues What should the developers implement to meet this need?

A. Publish errors to a dedicated Amazon SQS queue
B. Create an Amazon CloudWatch Events event to trigger based on certain Lambda events.
C. Report errors through logging statements in Lambda function code.
D. Set up an Amazon SNS topic that sends logging statements upon failure

Correct Answer: B

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QUESTION 1
A company maintains a REST service using Amazon API Gateway and the API Gateway native API key validation. The
company recently launched a new registration page, which allows users to sign up for the service. The registration page
creates a new API key using CreateApiKey and sends the new key to the user. When the user attempts to call the API
using this key, the user receives a 403 Forbidden error. Existing users are unaffected and can still call the API.
What code updates will grant these new users access to the API?
A. The createDeployment method must be called so the API can be redeployed to include the newly created API key.
B. The updateAuthorizer method must be called to update the API\\’s authorizer to include the newly created API key.
C. The importApiKeys method must be called to import all newly created API keys into the current stage of the API.
D. The createUsagePlanKey method must be called to associate the newly created API key with the correct usage
plan.
Correct Answer: A
https://stackoverflow.com/questions/39061041/using-an-api-key-in-amazon-api-gateway


QUESTION 2
A company has an application where reading objects from Amazon S3 is based on the type of user. The user types are
registered user and guest user. The company has 25,000 users and is growing. Information is pulled from an S3 bucket
depending on the user type.
Which approaches are recommended to provide access to both user types? (Choose two.)
A. Provide a different access key and secret access key in the application code for registered users and guest users to
provide read access to the objects.
B. Use S3 bucket policies to restrict read access to specific IAM users.
C. Use Amazon Cognito to provide access using authenticated and unauthenticated roles.
D. Create a new IAM user for each user and grant read access.
E. Use the AWS IAM service and let the application assume the different roles using the AWS Security Token Service
(AWS STS) AssumeRole action depending on the type of user and provide read access to Amazon S3 using the
assumed role.
Correct Answer: AB

QUESTION 3
Which EC2 API call would you use to retrieve a list of Amazon Machine Images (AMIs)?
A. DescnbeInstances
B. DescribeAMls
C. DescribeImages
D. GetAMls
E. You cannot retrieve a list of AMIs as there are over 10,000 AMIs
Correct Answer: C
https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeImages.html Describes the specified images
(AMIs, AKIs, and ARIs) available to you or all of the images available to you.


QUESTION 4
A Developer is trying to deploy a serverless application using AWS CodeDeploy. The application was updated and
needs to be redeployed.
What file does the Developer need to update to push that change through CodeDeploy?
A. dockerrun.aws.json
B. buildspec.yml
C. appspec.yml
D. ebextensions.config
Correct Answer: C
https://docs.aws.amazon.com/codedeploy/latest/userguide/application-revisions-push.html


QUESTION 5
Which of the following statements about SWF are true? Choose 3 answers
A. SWF tasks are assigned once and never duplicated
B. SWF requires an S3 bucket for workflow storage
C. SWF workflow executions can last up to a year
D. SWF triggers SNS notifications on task assignment
E. SWF uses deciders and workers to complete tasks
F. SWF requires at least 1 EC2 instance per domain
Correct Answer: ACE

QUESTION 6
A serverless application uses an API Gateway and AWS Lambda.
Where should the Lambda function store its session information across function calls?
A. In an Amazon DynamoDB table
B. In an Amazon SQS queue
C. In the local filesystem
D. In an SQLite session table using -DSQLITE_ENABLE_SESSION
Correct Answer: A


QUESTION 7
An e-commerce web application that shares session state on-premises is being migrated to AWS. The application must
be fault tolerant, natively highly scalable, and any service interruption should not affect the user experience.
What is the best option to store the session state?
A. Store the session state in Amazon ElastiCache
B. Store the session state in Amazon CloudFront
C. Store the session state in Amazon S3
D. Enable session stickiness using elastic load balancers
Correct Answer: A
https://aws.amazon.com/caching/session-management/


QUESTION 8
An organization is storing large files in Amazon S3, and is writing a web application to display meta-data about the files
to end-users. Based on the metadata a user selects an object to download. The organization needs a mechanism to
index the files and provide single-digit millisecond latency retrieval for the metadata.
What AWS service should be used to accomplish this?
A. Amazon DynamoDB
B. Amazon EC2
C. AWS Lambda
D. Amazon RDS
Correct Answer: A
Amazon DynamoDB is a fast and flexible NoSQL database service for all applications that need consistent, single-digit
millisecond latency at any scale. It is a fully managed database and supports both document and key-value data models. Its flexible data model and reliable performance make it a great fit for mobile, web, gaming, ad-tech, Internet of
Things (IoT), and many other applications.

QUESTION 9
A company has a REST application comprised of an Amazon API Gateway and several AWS Lambda functions. A
developer is responding to an alert that the API Gateway\\’s HTTP response error rate has unexpectedly increased. The
developer must determine must which Lambda function is malfunctioning.
Which method would help the developer make this determination while minimizing delays?
A. Execute an Amazon Athena query against the API Gateway and Lambda execution logs.
B. Execute an Amazon CloudWatch Logs Insights query against the API Gateway and Lambda execution logs.
C. Download the API Gateway and Lambda execution logs from Amazon S3, and perform a line-by-line search against
them.
D. Download the API Gateway and Lambda execution logs from Amazon CloudWatch Events, and perform line-by-line
search against them.
Correct Answer: D


QUESTION 10
A Developer is creating a serverless website with content that includes HTML files, images, videos, and JavaScript
(client-side scripts).
Which combination of services should the Developer use to create the website?
A. Amazon S3 and Amazon CloudFront
B. Amazon EC2 and Amazon ElastiCache
C. Amazon ECS and Redis
D. AWS Lambda and Amazon API Gateway
Correct Answer: A
Reference: https://d1.awsstatic.com/whitepapers/Building%20Static%20Websites%20on%20AWS.pdf

QUESTION 11
What is the format of structured notification messages sent by Amazon SNS?
A. An XML object containing MessageId, UnsubscribeURL, Subject, Message and other values
B. An JSON object containing MessageId, DuplicateFlag, Message and other values
C. An XML object containing MessageId, DuplicateFlag, Message and other values
D. An JSON object containing MessageId, unsubscribeURL, Subject, Message and other values
Correct Answer: D
https://docs.aws.amazon.com/sns/latest/dg/sns-message-and-json-formats.html#http-notification-json


QUESTION 12
A company has a web application In an Amazon Elastic Container Service (Amazon ECS) cluster running hundreds of
secure services in AWS Fargate containers. The services are in target groups routed by an Application Load Balancer
(ALB) Application users log in to the website anonymously, but they must be authenticated using any OpenID Connect
protocol-compatible identity provider (IdP) to access the secure services Which authentication approach would meet
these requirements with the LEAST amount of effort?
A. Configure the services to use Amazon Cognito.
B. Configure the ALB to use Amazon Cognito
C. Configure the services to use AWS Security Token Service (AWS STS) with the OpenID Connect IdP.
D. Configure the Amazon ECS cluster to use AWS Security Token Service (AWS STS) with the OpenID Connect IdP
Correct Answer: A


QUESTION 13
A Developer is migrating existing applications to AWS. These applications use MongoDB as their primary data store,
and they will be deployed to Amazon EC2 instances. Management requires that the Developer minimize changes to
applications while using AWS services
Which solution should the Developer use to host MongoDB in AWS?
A. Install MongoDB on the same instance where the application is running
B. Deploy Amazon DocumentDB in MongoDB compatibility mode
C. Use Amazon API Gateway to translate API calls from MongoDB to Amazon DynamoDB.
D. Replicate the existing MongoDB workload to Amazon DynamoDB
Correct Answer: D

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QUESTION 1
Company C has recently launched an online commerce site for bicycles on AWS. They have a “Product” DynamoDB
table that stores details for each bicycle, such as, manufacturer, color, price, quantity and size to display in the online
store. Due to customer demand, they want to include an image for each bicycle along with the existing details.
Which approach below provides the least impact to provisioned throughput on the “Product” table?
A. Serialize the image and store it in multiple DynamoDB tables
B. Create an “Images” DynamoDB table to store the Image with a foreign key constraint to the “Product” table
C. Add an image data type to the “Product” table to store the images in binary format
D. Store the images in Amazon S3 and add an S3 URL pointer to the “Product” table item for each image
Correct Answer: D
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-use-s3-too.html#bp-use-s3-too-large-values
For example, consider the ProductCatalog table in the Creating Tables and Loading Data for Code Examples in
DynamoDB section. Items in this table store information about item price, description, book authors, and dimensions for
other products. If you wanted to store an image of each product that was too large to fit in an item, you could store the
images in Amazon S3 instead of in DynamoDB.

QUESTION 2
An application uses Lambda functions to extract metadata from files uploaded to an S3 bucket; the metadata is stored in
Amazon DynamoDB. The application starts behaving unexpectedly, and the Developer wants to examine the logs of the
Lambda function code for errors.
Based on this system configuration, where would the Developer find the logs?
A. Amazon S3
B. AWS CloudTrail
C. Amazon CloudWatch
D. Amazon DynamoDB
Correct Answer: C

QUESTION 3
A global company has an application running on Amazon EC2 instances that serves image files from Amazon S3. User
requests from the browser are causing high traffic, which results in degraded performance. Which optimization solution
should a Developer implement to increase application performance?
A. Create multiple prefix in the S3 bucket to increase the request rate
B. Create an Amazon ElastiCache cluster to cache and serve frequently accessed items.
C. Use Amazon CloudFront to serve the content of images stored in Amazon S3.
D. Submit a ticket to AWS support to request a rate limit increase for the S3 bucket.
Correct Answer: C

QUESTION 4
An AWS Lambda function generates a 3MB JSON file and then uploads it to an Amazon S3 bucket daily. The file
contains sensitive information, so the Developer must ensure that it is encrypted before uploading to the bucket. Which
of the following modifications should the Developer make to ensure that the data is encrypted before uploading it to the
bucket?
A. Use the default AWS KMS customer master key for S3 in the Lambda function code.
B. Use the S3 managed key and call the GenerateDataKey API to encrypt the file.
C. Use the GenerateDateKey API, then use that data key to encrypt the file in the Lambda function code.
D. Use a custom KMS customer master key created for S3 in the Lambda function code.
Correct Answer: C


QUESTION 5
A Developer is trying to monitor an application\\’s status by running a cron job that returns 1 if the service is up and 0 if
the service is down. The Developer created code that uses an AWS CLI put-metric-alarm command to publish the
custom metrics to Amazon CloudWatch and create an alarm. However, the Developer is unable to create an alarm as
the custom metrics do not appear in the CloudWatch console.
What is causing this issue?
A. Sending custom metrics using the CLI is not supported.
B. The Developer needs to use the put-metric-data command.
C. The Developer must use a unified CloudWatch agent to publish custom metrics.
D. The code is not running on an Amazon EC2 instance.
Correct Answer: B

QUESTION 6
A Developer wants access to make the log data of an application running on an EC2 instance available to systems
administrators. Which of the following enables monitoring of this metric in Amazon CloudWatch?
A. Retrieve the log data from CloudWatch using the GetMetricData API call
B. Retrieve the log data from AWS CloudTrail using the LookupEvents API call.
C. Launch a new EC2 instance, configure Amazon CloudWatch Events, and then install the application.
D. Install the Amazon CloudWatch Logs agent on the EC2 instance that the application is running on.
Correct Answer: D

QUESTION 7
A Developer has published an update to an application that is served to a global user base using Amazon CloudFront.
After deploying the application, users are not able to see the updated changes. How can the Developer resolve this
issue?
A. Remove the origin from the CloudFront configuration and add it again.
B. Disable forwarding of query strings and request headers from the CloudFront distribution configuration.
C. Invalidate all the application objects from the edge caches.
D. Disable the CloudFront distribution and enable it again to update all the edge locations.
Correct Answer: C
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Invalidation.html

QUESTION 8
How can a developer use a debugger for AWS Lambda code that is deployed with AWS Serverless Application Model
(AWS SAM)?
A. Download the Lambda code locally and use the AWS CLI to execute it
B. Use the Lambda console to connect the debugger
C. Use AWS SAM to invoke a function locally in debug mode
D. Connect a third-party-compatible integrated development environment (IDE) to the Lambda debugger endpoint
Correct Answer: C
Reference: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-usingdebugging.html

QUESTION 9
When a Developer tries to run an AWS CodeBuild project, it raises an error because the length of all environment
variables exceeds the limit for the combined maximum of characters.
What is the recommended solution?
A. Add the export LC_ALL=”en_US.utf8″ command to the pre_build section to ensure POSIX localization.
B. Use Amazon Cognito to store key-value pairs for large numbers of environment variables.
C. Update the settings for the build project to use an Amazon S3 bucket for large numbers of environment variables.
D. Use AWS Systems Manager Parameter Store to store large numbers of environment variables.
Correct Answer: D


QUESTION 10
A Developer is designing a new application that uses Amazon S3. To satisfy compliance requirements, the Developer
must encrypt the data at rest. How can the Developer accomplish this?
A. Use s3:x-amz-acl as a condition in the S3 bucket policy.
B. Use Amazon RDS with default encryption.
C. Use aws:SecureTransport as a condition in the S3 bucket policy.
D. Turn on S3 default encryption for the S3 bucket.
Correct Answer: D

QUESTION 11
A company is building a compute-intensive application that will run on a fleet of Amazon EC2 instances. The application
uses attached Amazon EBS disks for storing data. The application will process sensitive information and all the data
must be encrypted.
What should a Developer do to ensure the data is encrypted on disk without impacting performance?
A. Configure the Amazon EC2 instance fleet to use encrypted EBS volumes for storing data.
B. Add logic to write all data to an encrypted Amazon S3 bucket.
C. Add a custom encryption algorithm to the application that will encrypt and decrypt all data.
D. Create a new Amazon Machine Image (AMI) with an encrypted root volume and store the data to ephemeral disks.
Correct Answer: A
Reference: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html

QUESTION 12
A developer has written an Amazon kinesis Data streams application. As usage grows and traffic over time, the
application is regularly receiving provisionedThroughputExceededException error messages.
Which steps should the Developer take to resolve the error? (Select Two.)
A. Use Auto scaling to scale the stream for better performance.
B. Increase the delay between the GetRecords call and the PutRecords call.
C. Increase the number of shards in the data stream.
D. Specify a shard iterator using the shardlterator parameter.
E. Implement exponential backoff on the GetRecords call and the PutRecords call.
Correct Answer: CD
Reference: https://docs.aws.amazon.com/streams/latest/dev/troubleshooting-consumers.html

QUESTION 13
A deployment package uses the AWS CLI to copy files into any S3 bucket in the account, using access keys stored in
environment variables. The package is running on EC2 instances, and the instances have been modified to run with an
assumed IAM role and a more restrictive policy that allows access to only one bucket.
After the change, the Developer logs into the host and still has the ability to write into all of the S3 buckets in that
account.
What is the MOST likely cause of this situation?
A. An IAM inline policy is being used on the IAM role
B. An IAM managed policy is being used on the IAM role
C. The AWS CLI is corrupt and needs to be reinstalled
D. The AWS credential provider looks for instance profile credentials last
Correct Answer: B
https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/credentials.html

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