AWS-Certified-Developer-Associate Free Practice Test

An ecommerce application is running behind an Application Load Balancer. A developer observes some unexpected load on the application during non-peak hours. The developer wants to analyze patterns for the client IP addresses that use the application. Which HTTP header should the developer use for this analysis?

1. A. The X-Forwarded-Proto header
2. B. The X-F Forwarded-Host header
3. C. The X-Forwarded-For header
4. D. The X-Forwarded-Port header

Correct Answer: C
The HTTP header that the developer should use for this analysis is the X- Forwarded-For header. This header contains the IP address of the client that made the request to the Application Load Balancer. The developer can use this header to analyze patterns for the client IP addresses that use the application. The other headers either contain information about the protocol, host, or port of the request, which are not relevant for the analysis.
Reference: How Application Load Balancer works with your applications

A company has deployed an application on AWS Elastic Beanstalk. The company has configured the Auto Scaling group that is associated with the Elastic Beanstalk environment to have five Amazon EC2 instances. If the capacity is fewer than four EC2 instances during the deployment, application performance degrades. The company is using the all-at-once deployment policy.
What is the MOST cost-effective way to solve the deployment issue?

1. A. Change the Auto Scaling group to six desired instances.
2. B. Change the deployment policy to traffic splittin
3. C. Specify an evaluation time of 1 hour.
4. D. Change the deployment policy to rolling with additional batc
5. E. Specify a batch size of 1.
6. F. Change the deployment policy to rollin
7. G. Specify a batch size of 2.

Correct Answer: C
This solution will solve the deployment issue by deploying the new version of the application to one new EC2 instance at a time, while keeping the old version running on
the existing instances. This way, there will always be at least four instances serving traffic during the deployment, and no downtime or performance degradation will occur. Option A is not optimal because it will increase the cost of running the Elastic Beanstalk environment without solving the deployment issue. Option B is not optimal because it will split the traffic between two versions of the application, which may cause inconsistency and confusion for the customers. Option D is not optimal because it will deploy the new version of the application to two existing instances at a time, which may reduce the capacity below four instances during the deployment.
References: AWS Elastic Beanstalk Deployment Policies

A developer is working on a web application that uses Amazon DynamoDB as its data store The application has two DynamoDB tables one table that is named artists and one table that is named songs The artists table has artistName as the partition key. The songs table has songName as the partition key and artistName as the sort key
The table usage patterns include the retrieval of multiple songs and artists in a single database operation from the webpage. The developer needs a way to retrieve this information with minimal network traffic and optimal application performance.
Which solution will meet these requirements'?

1. A. Perform a BatchGetltem operation that returns items from the two table
2. B. Use the list of songName artistName keys for the songs table and the list of artistName key for the artists table.
3. C. Create a local secondary index (LSI) on the songs table that uses artistName as the partition key Perform a query operation for each artistName on the songs table that filters by the list of songName Perform a query operation for each artistName on the artists table
4. D. Perform a BatchGetltem operation on the songs table that uses the songName/artistName key
5. E. Perform a BatchGetltem operation on the artists table that uses artistName as the key.
6. F. Perform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.

Correct Answer: A
BatchGetItem can return one or multiple items from one or more tables. For reference check the link below https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.h tml

An online sales company is developing a serverless application that runs on AWS. The application uses an AWS Lambda function that calculates order success rates and stores the data in an Amazon DynamoDB table. A developer wants an efficient way to invoke the Lambda function every 15 minutes.
Which solution will meet this requirement with the LEAST development effort?

1. A. Create an Amazon EventBridge rule that has a rate expression that will run the rule every 15 minute
2. B. Add the Lambda function as the target of the EventBridge rule.
3. C. Create an AWS Systems Manager document that has a script that will invoke the Lambda function on Amazon EC2. Use a Systems Manager Run Command task to run the shell script every 15 minutes.
4. D. Create an AWS Step Functions state machin
5. E. Configure the state machine to invoke the Lambda function execution role at a specified interval by using a Wait stat
6. F. Set the interval to 15 minutes.
7. G. Provision a small Amazon EC2 instanc
8. H. Set up a cron job that invokes the Lambda function every 15 minutes.

Correct Answer: A
The best solution for this requirement is option A. Creating an Amazon EventBridge rule that has a rate expression that will run the rule every 15 minutes and adding the Lambda function as the target of the EventBridge rule is the most efficient way to invoke the Lambda function periodically. This solution does not require any additional resources or development effort, and it leverages the built-in scheduling capabilities of EventBridge1.

A developer is preparing to begin development of a new version of an application. The previous version of the application is deployed in a production environment. The developer needs to deploy fixes and updates to the current version during the development of the new version of the application. The code for the new version of the application is stored in AWS CodeCommit.
Which solution will meet these requirements?

1. A. From the main branch, create a feature branch for production bug fixe
2. B. Create a second feature branch from the main branch for development of the new version.
3. C. Create a Git tag of the code that is currently deployed in productio
4. D. Create a Git tag for the development of the new versio
5. E. Push the two tags to the CodeCommit repository.
6. F. From the main branch, create a branch of the code that is currently deployed in productio
7. G. Apply an IAM policy that ensures no other other users can push or merge to the branch.
8. H. Create a new CodeCommit repository for development of the new version of the applicatio
9. I. Create a Git tag for the development of the new version.

Correct Answer: A<imgsrc="/images/AWS-Certified-Developer-Associate.files/image004.png"class="img-responsive"alt="AWS-Certified-Developer-Associatedumpsexhibit">
✑ A feature branch is a branch that is created from the main branch to work on a specific feature or task1. Feature branches allow developers to isolate their work from the main branch and avoid conflicts with other changes1. Feature branches can be merged back to the main branch when the feature or task is completed and tested1.
✑ In this scenario, the developer needs to maintain two parallel streams of work: one for fixing and updating the current version of the application that is deployed in production, and another for developing the new version of the application. The developer can use feature branches to achieve this goal.
✑ The developer can create a feature branch from the main branch for production bug fixes. This branch will contain the code that is currently deployed in production, and any fixes or updates that need to be applied to it. The developer can push this branch to the CodeCommit repository and use it to deploy changes to the production environment.
✑ The developer can also create a second feature branch from the main branch for development of the new version of the application. This branch will contain the code that is under development for the new version, and any changes or enhancements that are part of it. The developer can push this branch to the CodeCommit repository and use it to test and deploy the new version of the application in a separate environment.
✑ By using feature branches, the developer can keep the main branch stable and clean, and avoid mixing code from different versions of the application. The developer can also easily switch between branches and merge them when needed.