Question 1

A Development team wants to immediately build and deploy an application whenever there is a change to the source code. Which approaches could be used to trigger the deployment? (Choose two.)

Accepted Answer

A)  Store the source code in an Amazon S3 bucket. Configure AWS CodePipeline to start whenever a file in the bucket changes. 
B)  Store the source code in an encrypted Amazon EBS volume. Configure AWS CodePipeline to start whenever a file in the volume changes. 
C)  Store the source code in an AWS CodeCommit repository. Configure AWS CodePipeline to start whenever a change is committed to the repository. 
D)  Store the source code in an Amazon S3 bucket. Configure AWS CodePipeline to start every 15 minutes. 
E)  Store the source code in an Amazon EC2 instance's ephemeral storage. Configure the instance to start AWS CodePipeline whenever there are changes to the source code.

Question 2

A nightly batch job loads 1 million new records into a DynamoDB table. The records are only needed for one hour, and the table needs to be empty by the next night's batch job. Which is the MOST efficient and cost-effective method to provide an empty table?

Accepted Answer

A)  Use DeleteItem using a ConditionExpression . Use DeleteItem using a ConditionExpression . 
B)  Use BatchWriteItem to empty all of the rows. BatchWriteItem to empty all of the rows. 
C)  Write a recursive function that scans and calls out DeleteItem . Write a recursive function that scans and calls out 
D)  Create and then delete the table after the task has completed.

Question 3

A developer is troubleshooting the permissions of an application that needs to make changes to an Amazon RDS database. The developer has access to the IAM role that the application is using. Which command structure should the developer use to test the role permissions?

Accepted Answer

A)  aws sts assume-role 
B)  aws iam attach-role-policy 
C)  aws ssm resume-session 
D)  aws rds add-role-to-db-cluster

Question 4

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?

Accepted Answer

A)  Amazon S3 and Amazon CloudFront 
B)  Amazon EC2 and Amazon ElastiCache 
C)  Amazon ECS and Redis 
D)  AWS Lambda and Amazon API Gateway

Question 5

The development team is working on an API that will be served from Amazon API gateway. The API will be served from three environments: development, test, and production. The API Gateway is configured to use 237 GB of cache in all three stages. Which is the MOST cost-efficient deployment strategy?

Accepted Answer

A)  Create a single API Gateway with all three stages. 
B)  Create three API Gateways, one for each stage in a single AWS account. 
C)  Create an API Gateway in three separate AWS accounts. 
D)  Enable the cache for development and test environments only when needed.

Question 6

A company uses Amazon DynamoDB for managing and tracking orders. The DynamoDB table is partitioned based on the order date. The company receives a huge increase in orders during a sales event, causing DynamoDB writes to throttle, and the consumed throughput is far below the provisioned throughput. According to AWS best practices, how can this issue be resolved with MINIMAL costs?

Accepted Answer

A)  Create a new DynamoDB table for every order date. 
B)  Increase the read and write capacity units of the DynamoDB table. 
C)  Add a random number suffix to the partition key values. 
D)  Add a global secondary index to the DynamoDB table.

Question 7

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?

Accepted Answer

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

Question 8

A company is developing an application that will run on several Amazon EC2 instances in an Auto Scaling group and can access a database running on Amazon EC2. The application needs to store secrets required to connect to the database. The application must allow for periodic secret rotation, and there should be no changes to the application when a secret changes. What is the SAFEST way to meet these requirements?

Accepted Answer

A)  Associate an IAM role to the EC2 instance where the application is running with permission to access the database. 
B)  Use AWS Systems Manager Parameter Store with the SecureString data type to store secrets. Use AWS Systems Manager Parameter Store with the SecureString data type to store secrets. 
C)  Configure the application to store secrets in Amazon S3 object metadata. 
D)  Hard code the database secrets in the application code itself.

Question 9

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

Accepted Answer

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.

Question 10

A developer is designing a distributed application built using a microservices architecture spanning multiple AWS accounts. The company's operations team wants to analyze and debug application issues from a centralized account. How can the developer meet these requirements?

Accepted Answer

A)  Use an Amazon X-Ray agent with role assumption to publish data into the centralized account. 
B)  Use Amazon X-Ray and create a new IAM user to publish the access keys into the centralized account. 
C)  Use VPC Flow Logs to collect applications logs across different accounts. 
D)  Enable AWS CloudTrail to publish the trails in an Amazon S3 bucket in the centralized account.

Question 11

A developer is building an AWS Lambda function that will dynamically generate and send a weekly newsletter to 100,000 users. This newsletter contains both static text and images. The developer needs a fast and highly scalable place to store the images that will be hyperlinked in the newsletter. Where should the developer store these images?

Accepted Answer

A)  Use an Amazon DynamoDB table with DynamoDB Streams and read capacity auto scaling enabled. 
B)  Use an Amazon S3 bucket and S3 Transfer Acceleration to speed up the image download. 
C)  Use an Amazon Aurora database with a public DNS endpoint and auto scaling enabled. 
D)  Use an Amazon S3 backed Amazon CloudFront distribution with a high Time-to-Live (TTL) to maximize caching.

Question 12

What does an Amazon SQS delay queue accomplish?

Accepted Answer

A)  Messages are hidden for a configurable amount of time when they are first added to the queue. 
B)  Messages are hidden for a configurable amount of time after they are consumed from the queue. 
C)  The consumer can poll the queue for a configurable amount of time before retrieving a message. 
D)  Message cannot be deleted for a configurable amount of time after they are consumed from the queue.

Question 13

A Developer created a new AWS account and must create a scalable AWS Lambda function that meets the following requirements for concurrent execution: Average execution time of 100 seconds 50 requests per second Which step must be taken prior to deployment to prevent errors?

Accepted Answer

A)  Implement dead-letter queues to capture invocation errors 
B)  Add an event source from Amazon API Gateway to the Lambda function 
C)  Implement error handling within the application code 
D)  Contact AWS Support to increase the concurrent execution limits

Question 14

Which of the following platforms are supported by Elastic Beanstalk? (Choose two.)

Accepted Answer

A)  Apache Tomcat 
B)  .NET 
C)  IBM Websphere 
D)  Oracle JBoss 
E)  Jetty

Question 15

A Developer has setup an Amazon Kinesis Stream with 4 shards to ingest a maximum of 2500 records per second. A Lambda function has been configured to process these records. In which order will these records be processed?

Accepted Answer

A)  Lambda will receive each record in the reverse order it was placed into the stream following a LIFO (last-in, first-out) method 
B)  Lambda will receive each record in the exact order it was placed into the stream following a FIFO (first-in, first-out) method. 
C)  Lambda will receive each record in the exact order it was placed into the shard following a FIFO (first-in, first-out) method. There is no guarantee of order across shards. 
D)  The Developer can select FIFO, (first-in, first-out), LIFO (last-in, last-out), random, or request specific record using the getRecords API. The Developer can select FIFO, (first-in, first-out), LIFO (last-in, last-out), random, or request specific record using the getRecords API.

Question 16

A Developer is leveraging a Border Gateway Protocol (BGP)-based AWS VPN connection to connect from on-premises to Amazon EC2 instances in the Developer's account. The Developer is able to access an EC2 instance in subnet A, but is unable to access an EC2 instance in subnet B in the same VPC. Which logs can the Developer use to verify whether the traffic is reaching subnet B?

Accepted Answer

A)  VPN logs 
B)  BGP logs 
C)  VPC Flow Logs 
D)  AWS CloudTrail logs

Question 17

A developer has created a REST API using Amazon API Gateway. The developer wants to log who and how each caller accesses the API. The developer also wants to control how long the logs are kept. What should the developer do to meet these requirements?

Accepted Answer

A)  Enable API Gateway execution logging. Delete old logs using API Gateway retention settings. 
B)  Enable API Gateway access logs. Use Amazon CloudWatch retention settings to delete old logs. 
C)  Enable detailed Amazon CloudWatch metrics. Delete old logs with a recurring AWS Lambda function. 
D)  Create and use API Gateway usage plans. Delete old logs with a recurring AWS Lambda function.

Question 18

A developer is attempting to use the Amazon S3 PutObject API operation to upload an object to an S3 bucket that has default encryption enabled. The developer receives a 400 Bad Request error. What is the most likely cause of this error?

Accepted Answer

A)  The API operation cannot access the encryption key. 
B)  The HTTP Content-Length header is missing. 
C)  The object exceeds the maximum object size that is allowed. 
D)  The S3 bucket exceeds the maximum storage capacity that is allowed.

Question 19

A Developer has developed a web application and wants to deploy it quickly on a Tomcat server on AWS. The Developer wants to avoid having to manage the underlying infrastructure. What is the easiest way to deploy the application, based on these requirements?

Accepted Answer

A)  AWS CloudFormation 
B)  AWS Elastic Beanstalk 
C)  Amazon S3 
D)  AWS CodePipeline

Question 20

How should custom libraries be utilized in AWS Lambda?

Accepted Answer

A)  Host the library on Amazon S3 and reference to it from the Lambda function. 
B)  Install the library locally and upload a ZIP file of the Lambda function. 
C)  Import the necessary Lambda blueprint when creating the function. 
D)  Modify the function runtime to include the necessary library.

Exam 6: AWS Certified Developer Associate (DVA-C01)