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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q553-Q558):

NEW QUESTION # 553
A company is setting up a centralized logging solution on AWS and has several requirements. The company wants its Amazon CloudWatch Logs and VPC Flow logs to come from different sub accounts and to be delivered to a single auditing account. However, the number of sub accounts keeps changing. The company also needs to index the logs in the auditing account to gather actionable insight. How should a DevOps Engineer implement the solution to meet all of the company's requirements?

A. Use AWS Lambda to write logs to Amazon ES in the auditing account. Create a CloudWatch subscription filter and use Lambda in the sub accounts to stream the logs to the Lambda function deployed in the auditing account.
B. Use AWS Lambda to write logs to Amazon ES in the auditing account. Create an Amazon CloudWatch subscription filter and use Amazon Kinesis Data Streams in the sub accounts to stream the logs to the Lambda function deployed in the auditing account.
C. Use Amazon Kinesis Streams to write logs to Amazon ES in the auditing account. Create a CloudWatch subscription filter and use Kinesis Data Streams in the sub accounts to stream the logs to the Kinesis stream in the auditing account.
D. Use Amazon Kinesis Firehose with Kinesis Data Streams to write logs to Amazon ES in the auditing account. Create a CloudWatch subscription filter and stream logs from sub accounts to the Kinesis stream in the auditing account.

Answer: D

Explanation:
https://aws.amazon.com/pt/blogs/architecture/central-logging-in-multi-account-environments/

NEW QUESTION # 554
A company has developed a Node.js web application which provides REST services to store and retrieve time series data. The web application is built by the Development team on company laptops, tested locally, and manually deployed to a single on-premises server, which accesses a local MySQL database. The company is starting a trial in two weeks, during which the application will undergo frequent updates based on customer feedback. The following requirements must be met:
- The team must be able to reliably build, test, and deploy new updates on a daily basis, without downtime or degraded performance.
- The application must be able to scale to meet an unpredictable number of concurrent users during the trial.
Which action will allow the team to quickly meet these objectives?

A. Modify the application to use Amazon DynamoDB instead of a local MySQL database. Use AWS OpsWorks to create a stack for the application with a DynamoDB layer, an Application Load Balancer layer, and an Amazon EC2 instance layer. Use a Chef recipe to build the application and a Chef recipe to deploy the application to the EC2 instance layer. Use custom health checks to run unit tests on each instance with rollback on failure.
B. Develop an AWS CloudFormation template to create an Application Load Balancer and two Amazon EC2 instances with Amazon EBS (SSD) volumes in an Auto Scaling group with rolling updates enabled. Use AWS CodeBuild to build and test the Node.js application and store it in an Amazon S3 bucket. Use user-data scripts to install the application and the MySQL database on each EC2 instance.
Update the stack to deploy new application versions.
C. Configure AWS Elastic Beanstalk to automatically build the application using AWS CodeBuild and to deploy it to a test environment that is configured to support auto scaling. Create a second Elastic Beanstalk environment for production. Use Amazon RDS to store data. When new versions of the applications have passed all tests, use Elastic Beanstalk `swap cname' to promote the test environment to production.
D. Create two Amazon Lightsail virtual private servers for Node.js; one for test and one for production.
Build the Node.js application using existing process and upload it to the new Lightsail test server using the AWS CLI. Test the application, and if it passes all tests, upload it to the production server. During the trial, monitor the production server usage, and if needed, increase performance by upgrading the instance type.

Answer: A

NEW QUESTION # 555
You have a set of EC2 Instances hosting an nginx server and a web application that is used by a set of users in your organization. After a recent application version upgrade, the instance runs into technical issues and needs an immediate restart. This does not give you enough time to inspect the cause of the issue on the server. Which of the following options if implemented prior to the incident would have assisted in detecting the underlying cause of the issue?

A. Install Cloudwatch logs agent on the instance and send all the logs to Cloudwatch logs.
B. Enabledetailed monitoring and check the Cloudwatch metrics to see the cause of theissue.
C. Streamall the data to Amazon Kinesis and then analyze the data in real time.
D. Createa snapshot of the EBS volume before restart, attach it to another instance as avolume and then diagnose the issue.

Answer: A

Explanation:
Explanation
The AWS documentation mentions the following
You can publish log data from Amazon CC2 instances running Linux or Windows Server, and logged events from AWS CloudTrail. CloudWatch Logs can consume logs from resources in any region, but you can only view the log data in the CloudWatch console in the regions where CloudWatch Logs is supported.
Option A is invalid as detailed monitoring will only help us to get more information about the performance metrics of the instances, volumes etc and will not be able to provide full information regarding technical issues.
Option B is incorrect if we had created a snapshot prior to the update it might be useful but not after the incident.
Option C is incorrect here we are dealing with an issue concerning the underlying application that handles the data so this solution will not help.
For more information on Cloudwatch logs, please refer to the below link:
* http://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/StartTheCWLAgent.htmI

NEW QUESTION # 556
If your application performs operations or workflows that take a long time to complete, what service can the Elastic Beanstalk environment do for you?

A. Manages the ELB and running a daemon process on each instance
B. Manages a Amazon SQS queue and running a daemon process on each instance
C. Manages a Amazon SNS Topic and running a daemon process on each instance
D. Manages Lambda functions and running a daemon process on each instance

Answer: B

Explanation:
Explanation
Elastic Beanstalk simplifies this process by managing the Amazon SQS queue and running a daemon process on each instance that reads from the queue for you.
When
the daemon pulls an item from the queue, it sends an HTTP POST request locally to http://localhost/ with the contents of the queue message in the body. All that your application needs to do is perform the long-running task in response to the POST.
For more information Elastic Beanstalk managing worker environments, please visit the below URL:
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features-managing-env-tiers.htmI

NEW QUESTION # 557
You run accounting software in the AWS cloud. This software needs to be online continuously during the day every day of the week, and has a very static requirement for compute resources.
You also have other, unrelated batch jobs that need to run once per day at any time of your choosing. How should you minimize cost?

A. Purchase a Heavy Utilization Reserved Instance to run the accounting software. Turn it off after hours.
Run the batch jobs with the same instance class, so the Reserved Instance credits are also applied to the batch jobs.
B. Purchase a Light Utilization Reserved Instance to run the accounting software. Turn it off after hours.
Run the batch jobs with the same instance class, so the Reserved Instance credits are also applied to the batch jobs.
C. Purchase a Full Utilization Reserved Instance to run the accounting software. Turn it off after hours.
Run the batch jobs with the same instance class, so the Reserved Instance credits are also applied to the batch jobs.
D. Purchase a Medium Utilization Reserved Instance to run the accounting software. Turn it off after hours.
Run the batch jobs with the same instance class, so the Reserved Instance credits are also applied to the batch jobs.

Answer: A

Explanation:
Because the instance will always be online during the day, in a predictable manner, and there are a sequence of batch jobs to perform at any time, we should run the batch jobs when the account software is off. We can achieve Heavy Utilization by alternating these times, so we should purchase the reservation as such, as this represents the lowest cost. There is no such thing a
"Full" level utilization purchases on EC2.
https://d0.awsstatic.com/whitepapers/Cost_Optimization_with_AWS.pdf

NEW QUESTION # 558
......

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