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The AWS-DevOps Certification Exam is intended for professionals who have experience in administering and managing AWS solutions and who want to validate their expertise in DevOps practices. Candidates should have a strong understanding of AWS services and architecture, as well as experience with automation and scripting languages such as Python, Ruby, or Perl. They should also be familiar with DevOps tools such as Jenkins, Puppet, and Chef.

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q102-Q107):

NEW QUESTION # 102
You work for a company that automatically tags photographs using artificial neural networks (ANNs), which run on GPUs using C++. You receive millions of images at a time, but only 3 times per day on average. These images are loaded into an AWS S3 bucket you control for you in a batch, and then the customer publishes a JSON-formatted manifest into another S3 bucket you control as well. Each image takes 10 milliseconds to process using a full GPU. Your neural network software requires 5 minutes to bootstrap. Image tags are JSON objects, and you must publish them to an S3 bucket. Which of these is the best system architectures for this system?

A. Make an S3 notification configuration which publishes to AWS Lambda on the manifest bucket.
Make the Lambda create a CloudFormation Stack which contains the logic to construct an autoscaling worker tier of EC2 G2 instances with the ANN code on each instance. Create an SQS queue of the images in the manifest. Tear the stack down when the queue is empty.
B. Create an Auto Scaling, Load Balanced Elastic Beanstalk worker tier Application and Environment.
Deploy the ANN code to G2 instances in this tier. Set the desired capacity to 1. Make the code periodically check S3 for new manifests. When a new manifest is detected, push all of the images in the manifest into the SQS queue associated with the Elastic Beanstalk worker tier.
C. Deploy your ANN code to AWS Lambda as a bundled binary for the C++ extension. Make an S3 notification configuration on the manifest, which publishes to another AWS Lambda running controller code. This controller code publishes all the images in the manifest to AWS Kinesis.
Your ANN code Lambda Function uses the Kinesis as an Event Source. The system automatically scales when the stream contains image events.
D. Create an OpsWorks Stack with two Layers. The first contains lifecycle scripts for launching and bootstrapping an HTTP API on G2 instances for ANN image processing, and the second has an always-on instance which monitors the S3 manifest bucket for new files. When a new file is detected, request instances to boot on the ANN layer. When the instances are booted and the HTTP APIs are up, submit processing requests to individual instances.

Answer: A

Explanation:
The Elastic Beanstalk option is incorrect because it requires a constantly-polling instance, which may break and costs money.
The Lambda fleet option is incorrect because AWS Lambda does not support GPU usage. The OpsWorks stack option both requires a constantly-polling instance, and also requires complex timing and capacity planning logic.
The CloudFormation option requires no polling, has no always-on instances, and allows arbitrarily fast processing by simply setting the instance count as high as needed.
http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html

NEW QUESTION # 103
You are designing a cloudformation template to install a set of web servers on EC2 Instances. The following
User data needs to be passed to the EC2 Instances
#!/bin/bash
sudo apt-get update
sudo apt-get install -y nginx
Where in the cloudformation template would you ideally pass this User Data

A. Inthe properties section oftheEC2 Instance in the resources section
B. Inthe Metadata section of the EC2 Instance in the Output section
C. Inthe Metadata section of the EC2 Instance in the resources section
D. Inthe properties section of the EC2 Instance in the Output section

Answer: A

Explanation:
Explanation

For more information on User data in cloudformation templates, please refer to the below link:
* http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/depl
oying.applications.htm I

NEW QUESTION # 104
A user is trying to save some cost on the AWS services. Which of the below mentioned options will not help him save cost?

A. Delete the AWS ELB after the instances are terminated
B. Delete the AutoScaling launch configuration after the instances are terminated
C. Delete the unutilized EBS volumes once the instance is terminated
D. Release the elastic IP if not required once the instance is terminated

Answer: B

Explanation:
Explanation
Option A is wrong because CBS volumes does have a costing aspect and hence deleting the volumes will save on cost Option C is wrong because Elastic IP will consume cost if not removed.
Option D is wrong because CLB also incur costs.
Only Autoscaling groups are free of cost. It's only the underlying resources which you are charged for.
For more information on AWS Pricing, please visit the link:
* https://aws.amazon.com/pricing/services/

NEW QUESTION # 105
Your team is responsible for an AWS Elastic Beanstalk application. The business requires that you move to a
continuous deployment model, releasing updates to the application multiple times per day with zero downtime.
What should you do to enable this and still be able to roll back almost immediately in an emergency to the
previous version?

A. Developthe application to poll for a new application version in your code repository;download and
install to each running Elastic Beanstalk instance.
B. Enablerolling updates in the Elastic Beanstalk environment, setting an appropriatepause time for
application startup.
C. Createa second Elastic Beanstalk environment running the new application version, andswap the
environment CNAMEs.
D. Createa second Elastic Beanstalk environment with the new application version, andconfigure the old
environment to redirect clients, using the HTTP 301 responsecode, to the new environment

Answer: C

Explanation:
Explanation
The AWS Documentation mentions the below
Because Elastic Beanstalk performs an in-place update when you update your application versions, your
application may become unavailable to users for a short
period of time. It is possible to avoid this downtime by performing a blue/green deployment, where you deploy
the new version to a separate environment, and then
swap CNAMCs of the two environments to redirect traffic to the new version instantly
For more information on Elastic beanstalk swap URL please see the below link:
* http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.CNAM
CSwap.html

NEW QUESTION # 106
A DevOps engineer is tasked with creating a more stable deployment solution for a web application in AWS.
Previous deployments have resulted in user-facing bugs, premature user traffic, and inconsistencies between web servers running behind an Application Load Balancer. The current strategy uses AWS CodeCommit to store the code for the application. When developers push to the master branch of the repository. CodeCommit triggers an AWS Lambda deploy function, which invokes an AWS Systems Manager run command to build and deploy the new code to all Amazon EC2 instances.
Which combination of actions should be taken to implement a more stable deployment solution? (Select TWO.)

A. Create a pipeline in AWS CodePipeline with CodeCommit as a source provider. Create parallel pipeline stages to build and test the application. Pass the build artifact to AWS CodeDeploy.
B. Create a pipeline in AWS CodePipeline with CodeCommit as a source provider. Create separate pipeline stages to build and then test the application. Pass the build artifact to AWS CodeDeploy.
C. Create and use an AWS CodeDeploy application and deployment group to deploy code updates to the EC2 fleet. Select the Application Load Balancer for the deployment group.
D. Create individual Lambda functions to run all build, test, and deploy actions using AWS CodeDeploy instead of AWS Systems Manager.
E. Modify the Lambda function to build a single application package to be shared by all instances. Use AWS CodeDeploy instead of AWS Systems Manager to update the code on the EC2 fleet.

Answer: C,E

NEW QUESTION # 107
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