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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q453-Q458):

NEW QUESTION # 453
A company has an application that is using a MySQL -compatible Amazon Aurora Multi-AZ DB cluster as the database A cross-Region read replica has been created for disaster recovery purposes A DevOps engineer wants to automate the promotion of the replica so it becomes the primary database instance in the event of a failure Which solution will accomplish this?

A. Create an Aurora custom endpoint to point to the primary database instance Configure the application to use this endpoint Configure AWS CloudTrail to run an AWS Lambda function to promote the replica instance and modify the custom endpoint to point to the newly promoted instance.
B. Create an AWS Lambda function to modify the application's AWS CloudFormation template to promote the replica, apply the template to update the stack, and pout the application to the newly promoted instance Create an Amazon CloudWatch alarm to trigger this Lambda function after the failure event occurs
C. Store the Aurora endpoint in AWS Systems Manager Parameter Store Create an Amazon EventBridge (Amazon CloudWatch Events) event that detects the database failure and runs an AWS Lambda function to promote the replica instance and update the endpoint URL stored in AWS Systems Manager Parameter Store Code the application to reload the endpoint from Parameter Store if a database connection fails.
D. Configure a latency-based Amazon Route 53 CNAME with health checks so it points to both the primary and replica endpoints Subscribe an Amazon SNS topic to Amazon RDS failure notifications from AWS CloudTrail and use that topic to trigger an AWS Lambda function that will promote the replica instance as the master.

Answer: D

NEW QUESTION # 454
Your company operates an application consisting of an AWS CloudFormation stack that contains a load balancer, an Auto Scaling group of web servers, and an Amazon RDS instance.
To save time and costs, you update the current test stack when testing minor changes, and create a new stack for major changes.
As part of the testing procedure of your application, each version needs to be registered once and only once with a Configuration Management Database (CMDB).
What cost-effective solution should you choose to perform this registration?

A. Define an AWS::CloudFormation::HttpRequest in the AWS CloudFormation template, and configure it to notify the CMDB on stack creation and update.
B. Use Auto Scaling Leader Node functionality to notify the registration application from the UserData script of a single Instance.
Use the AWS CloudFormation cfn-hup helper application to receive template updates on the leader node, which then notifies the CMDB.
C. Define an AWS::EC2::Instance resource in the AWS CloudFormation template that is configured to run a UserData script to notify the CMDB and then terminate itself on completion.
D. Define an AWS: :CloudFormation::CustomResource in the AWS CloudFormation template, with the application version as one of its properties.
Modify the CMDB to subscribe to the resource's creation and update notifications.

Answer: D

NEW QUESTION # 455
You are working for a startup company that is building an application that receives large amounts of data.
Unfortunately, current funding has left the start-up short on cash, cannot afford to purchase thousands of
dollars of storage hardware, and has opted to use AWS. Which services would you implement in order to store
a virtually unlimited amount of data without any effort to scale when demand unexpectedly increases? Choose
the correct answer from the options below

A. AmazonGlacier, to keep costs low for storage and scale infinitely
B. Amazonlmport/Export, because Amazon assists in migrating large amounts of data toAmazon S3
C. AmazonEC2, because EBS volumes can scale to hold any amount of data and, when usedwith Auto
Scaling, can be designed for fault tolerance and high availability
D. AmazonS3, because it provides unlimited amounts of storage data, scales automatically highly available,
and durable

Answer: D

Explanation:
Explanation
The best option is to use S3 because you can host a large amount of data in S3 and is the best storage option
provided by AWS.
For more information on S3, please refer to the below link:
* http://docs.aws.a
mazon.com/AmazonS3/latest/dev/We lcome.htm I

NEW QUESTION # 456
A DevOps team wants to be able to work on the same source code repository. The team has the following requirements for their development workflow and repository access controls:
- Only team members can clone the repository and create new branches.
- A production-ready code state should be isolated from any untested code changes.
- Code changes should be approved by another team member before merging to the production- ready master branch.
- All code change approvals must have an audit record.
- New team members can quickly modify code.
Which combination of actions will these requirements? (Choose three.)

A. Create an AWS CodeCommit repository and an IAM group with permissions to read/write changes to the repository.
Add new team members to this group.
B. Create a local feature branch from the master branch for new features.
Commit the new code and push the changes to the feature branch in the repository.
C. Create a pull request so other team members can review the code changes.
Implement any suggestions, pull any additional changes from the master branch, resolve any conflicts, and push to the feature branch again.
Merge the feature branch with the master branch.
D. Create an AWS CodeCommit repository and an IAM role with permissions to read/write changes to the repository.
Attach this IAM role to a single IAM user.
Ensure each member of the team uses this IAM user.
Provide new team members the credentials to this IAM user.
E. Create a pull request so other team members can review the code changes.
Implement any suggestions, pull any additional changes from the master branch, and push to the feature branch again.
Merge the master branch with the feature branch.
F. Check out the master branch and develop new features locally on a feature branch to keep the production-ready code isolated.
Ask team members to review the changes before committing the changes locally.

Answer: A,D,F

NEW QUESTION # 457
You are doing a load testing exercise on your application hosted on AWS. While testing your Amazon RDS MySQL DB instance, you notice that when you hit 100% CPU utilization on it, your application becomes non- responsive. Your application is read-heavy.
What are methods to scale your data tier to meet the application's needs? (Choose three.)

A. Shard your data set among multiple Amazon RDS DB instances.
B. Use ElastiCache in front of your Amazon RDS DB to cache common queries.
C. Enable Multi-AZ for your Amazon RDS DB instance.
D. Use an Amazon SQS queue to throttle data going to the Amazon RDS DB instance.
E. Add your Amazon RDS DB instance to an Auto Scaling group and configure your CloudWatch metric based on CPU utilization.
F. Add Amazon RDS DB read replicas, and have your application direct read queries to them.

Answer: A,B,F

NEW QUESTION # 458
......

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