Question 1

A Developer is designing a fault-tolerant environment where client sessions will be saved. How can the Developer ensure that no sessions are lost if an Amazon EC2 instance fails?

Accepted Answer

The answer of A Developer is designing a fault-tolerant environment...

Question 2

An e-commerce site allows returning users to log in to display customized web pages. The workflow is shown in the image below:  An application is running on EC2 instances. Amazon RDS is used for the database that stores user accounts and preferences. The website freezes or is slow to load while waiting for the login step to complete. The remaining components of the site are well-optimized. Which of the following techniques will resolve this issue? (Choose two.)

Accepted Answer

The answer of An e-commerce site allows returning users to...

Question 3

An AWS Lambda function must read data from an Amazon RDS MySQL database in a VPC and also reach a public endpoint over the internet to get additional data. Which steps must be taken to allow the function to access both the RDS resource and the public endpoint? (Choose two.)

Accepted Answer

The answer of An AWS Lambda function must read data...

Question 4

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?

Accepted Answer

Amazon ElastiCache is a managed in-memory caching service that provides high availability and scalability, making it suitable for storing session state in a fault-tolerant manner without affecting user experience.

Question 5

A Developer is creating a mobile application that will not require users to log in. What is the MOST efficient method to grant users access to AWS resources?

Accepted Answer

The answer of A Developer is creating a mobile application...

Question 6

A company has a website that is developed in PHP and WordPress and is launched using AWS Elastic Beanstalk. There is a new version of the website that needs to be deployed in the Elastic Beanstalk environment. The company cannot tolerate having the website offline if an update fails. Deployments must have minimal impact and rollback as soon as possible. What deployment method should be used?

Accepted Answer

Immutable deployments create a new set of instances with the new version, ensuring zero downtime and easy rollback if the deployment fails, meeting the company's requirements for minimal impact and quick rollback.

Question 7

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

The answer of A company is developing an application that...

Question 8

A company has three different environments: Development, QA, and Production. The company wants to deploy its code first in the Development environment, then QA, and then Production. Which AWS service can be used to meet this requirement?

Accepted Answer

The answer of A company has three different environments: Development,...

Question 9

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

Amazon S3 can be used to host static websites with HTML, images, and JavaScript, while Amazon CloudFront can be used to distribute the content globally with low latency.

Question 10

A Developer needs to design an application running on AWS that will be used to consume Amazon SQS messages that range from 1 KB up to 1GB in size. How should the Amazon SQS messages be managed?

Accepted Answer

The Amazon SQS Extended Client Library for Java allows storing message payloads in Amazon S3 for messages larger than 256 KB, which is suitable for handling messages up to 1GB.

Question 11

A company needs to secure its existing website running behind an Elastic Load Balancer. The website's Amazon EC2 instances are CPU-constrained. What should be done to secure the website while not increasing the CPU load on the EC2 web servers? (Choose two.)

Accepted Answer

The answer of A company needs to secure its existing...

Question 12

An AWS Lambda function must access an external site by using a regularly rotated user name and password. These items must be kept securely and cannot be stored in the function code. What combination of AWS services can be used to accomplish this? (Choose two.)

Accepted Answer

AWS Systems Manager Parameter Store can securely store and manage configuration data and secrets, such as passwords. AWS KMS (Key Management Service) can be used to encrypt and decrypt the secrets stored in Parameter Store, ensuring they are kept secure.

Question 13

A Developer must deploy a new AWS Lambda function using an AWS CloudFormation template. Which procedures will deploy a Lambda function? (Choose two.)

Accepted Answer

The answer of A Developer must deploy a new AWS...

Question 14

A Developer has been asked to make changes to the source code of an AWS Lambda function. The function is managed using an AWS CloudFormation template. The template is configured to load the source code from an Amazon S3 bucket. The Developer manually created a .ZIP file deployment package containing the changes and put the file into the correct location on Amazon S3. When the function is invoked, the code changes have not been applied. What step is required to update the function with the changes?

Accepted Answer

The answer of A Developer has been asked to make...

Question 15

A Developer is investigating an issue whereby certain requests are passing through an Amazon API Gateway endpoint /MyAPI, but the requests do not reach the AWS Lambda function backing /MyAPI. The Developer found that a second Lambda function sometimes runs at maximum concurrency allowed for the given AWS account. How can the Developer address this issue?

Accepted Answer

By configuring the second Lambda function's concurrency execution limit, the developer can ensure that it does not consume all available concurrency, allowing the first Lambda function to receive requests.

Question 16

A Developer wants to debug an application by searching and filtering log data. The application logs are stored in Amazon CloudWatch Logs. The Developer creates a new metric filter to count exceptions in the application logs. However, no results are returned from the logs. What is the reason that no filtered results are being returned?

Accepted Answer

CloudWatch Logs metric filters only apply to log events that occur after the filter is created. They do not retroactively apply to existing log data.

Question 17

A Developer is working on an application that handles 10MB documents that contain highly-sensitive data. The application will use AWS KMS to perform client-side encryption. What steps must be followed?

Accepted Answer

Invoke the Encrypt API passing the plaintext data that must be encrypted, then reference the customer managed key ARN in the KeyId parameter

Question 18

A company needs to distribute firmware updates to its customers around the world. Which service will allow easy and secure control of the access to the downloads at the lowest cost?

Accepted Answer

Using Amazon CloudFront with signed URLs for Amazon S3 allows the company to securely distribute firmware updates globally at a low cost by leveraging CloudFront's caching and S3's storage, while signed URLs ensure controlled access.

Question 19

A company maintains an application responsible for processing several thousand external callbacks each day. The company's System administrators want to know how many callbacks are being received on a rolling basis, and they want this data available for 10 days. The company also wants the ability to issue automated alerts if the number of callbacks exceeds the defined thresholds. What is the MOST cost-effective way to address the need to track and alert on these statistics?

Accepted Answer

The answer of A company maintains an application responsible for...

Question 20

A Developer wants to enable AWS X-Ray for a secure application that runs in an Amazon ECS environment. What combination of steps will enable X-Ray? (Choose three.)

Accepted Answer

The answer of A Developer wants to enable AWS X-Ray...

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